Remove trace feature which was experimental, deprecate subscriber accessor interface

[DavidBadura]

SubscriberAccessorInterface was introduced to implement the trace feature. Unfortunately, this feature was not as useful as expected and now makes further development of the subscription engine very difficult. Since the trace feature was only experimental, it can be removed without any problem. I have now deprecated the introduced interface. Since both were not documented, I assume that this change does not affect the developers.

[github-actions]

Hello 👋

here is the most recent benchmark result:

SubscriptionEngineBench
=======================

+---------------------------+-----------------+-----------------+-----------+-----------------+------------+-------------+
|                           | time (kde mode)                               | memory                                     |
+---------------------------+-----------------+-----------------+-----------+-----------------+------------+-------------+
| subject                   | Tag: <current>  | Tag: base       | time-diff | Tag: <current>  | Tag: base  | memory-diff |
+---------------------------+-----------------+-----------------+-----------+-----------------+------------+-------------+
| benchHandle10000Events () | 3.067s (±0.00%) | 3.069s (±0.00%) | -0.04%    | 34.734mb        | 34.742mb   | -0.02%      |
+---------------------------+-----------------+-----------------+-----------+-----------------+------------+-------------+

SubscriptionEngineBatchBench
============================

+---------------------------+-------------------+-------------------+-----------+-----------------+------------+-------------+
|                           | time (kde mode)                                   | memory                                     |
+---------------------------+-------------------+-------------------+-----------+-----------------+------------+-------------+
| subject                   | Tag: <current>    | Tag: base         | time-diff | Tag: <current>  | Tag: base  | memory-diff |
+---------------------------+-------------------+-------------------+-----------+-----------------+------------+-------------+
| benchHandle10000Events () | 69.341ms (±0.00%) | 70.047ms (±0.00%) | -1.01%    | 34.234mb        | 34.234mb   | 0.00%       |
+---------------------------+-------------------+-------------------+-----------+-----------------+------------+-------------+

SimpleSetupStreamStoreBench
===========================

+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
|                                        | time (kde mode)                                     | memory                                     |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
| subject                                | Tag: <current>     | Tag: base          | time-diff | Tag: <current>  | Tag: base  | memory-diff |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
| benchLoad1Event ()                     | 919.800μs (±0.00%) | 948.500μs (±0.00%) | -3.03%    | 34.744mb        | 34.744mb   | 0.00%       |
| benchLoad10000Events ()                | 46.856ms (±0.00%)  | 46.767ms (±0.00%)  | +0.19%    | 34.744mb        | 34.744mb   | 0.00%       |
| benchSave1Event ()                     | 1.022ms (±0.00%)   | 1.037ms (±0.00%)   | -1.39%    | 34.744mb        | 34.744mb   | 0.00%       |
| benchSave10000Events ()                | 209.515ms (±0.00%) | 215.137ms (±0.00%) | -2.61%    | 34.744mb        | 34.744mb   | 0.00%       |
| benchSave10000Aggregates ()            | 7.873s (±0.00%)    | 7.895s (±0.00%)    | -0.27%    | 34.744mb        | 34.744mb   | 0.00%       |
| benchSave10000AggregatesTransaction () | 4.679s (±0.00%)    | 4.673s (±0.00%)    | +0.14%    | 34.745mb        | 34.745mb   | 0.00%       |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+

SnapshotsBench
==============

+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
|                                        | time (kde mode)                                     | memory                                     |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
| subject                                | Tag: <current>     | Tag: base          | time-diff | Tag: <current>  | Tag: base  | memory-diff |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
| benchLoad10000EventsMissingSnapshot () | 50.483ms (±0.00%)  | 49.260ms (±0.00%)  | +2.48%    | 33.836mb        | 33.836mb   | 0.00%       |
| benchLoad10000Events ()                | 918.600μs (±0.00%) | 917.600μs (±0.00%) | +0.11%    | 33.836mb        | 33.836mb   | 0.00%       |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+

SplitStreamBench
================

+-------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
|                         | time (kde mode)                                     | memory                                     |
+-------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
| subject                 | Tag: <current>     | Tag: base          | time-diff | Tag: <current>  | Tag: base  | memory-diff |
+-------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
| benchLoad10000Events () | 4.246ms (±0.00%)   | 4.326ms (±0.00%)   | -1.84%    | 37.072mb        | 37.072mb   | 0.00%       |
| benchSave10000Events () | 334.364ms (±0.00%) | 343.420ms (±0.00%) | -2.64%    | 37.144mb        | 37.144mb   | 0.00%       |
+-------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+

PersonalDataBench
=================

+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
|                                        | time (kde mode)                                     | memory                                     |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
| subject                                | Tag: <current>     | Tag: base          | time-diff | Tag: <current>  | Tag: base  | memory-diff |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
| benchLoad1Event ()                     | 892.400μs (±0.00%) | 882.100μs (±0.00%) | +1.17%    | 34.895mb        | 34.895mb   | 0.00%       |
| benchLoad10000Events ()                | 84.889ms (±0.00%)  | 80.660ms (±0.00%)  | +5.24%    | 34.895mb        | 34.895mb   | 0.00%       |
| benchSave1Event ()                     | 1.512ms (±0.00%)   | 1.683ms (±0.00%)   | -10.17%   | 34.895mb        | 34.895mb   | 0.00%       |
| benchSave10000Events ()                | 241.596ms (±0.00%) | 241.017ms (±0.00%) | +0.24%    | 34.897mb        | 34.897mb   | 0.00%       |
| benchSave10000Aggregates ()            | 11.979s (±0.00%)   | 11.872s (±0.00%)   | +0.90%    | 34.895mb        | 34.895mb   | 0.00%       |
| benchSave10000AggregatesTransaction () | 8.723s (±0.00%)    | 8.738s (±0.00%)    | -0.16%    | 35.396mb        | 35.396mb   | 0.00%       |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+

SimpleSetupBench
================

+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
|                                        | time (kde mode)                                     | memory                                     |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
| subject                                | Tag: <current>     | Tag: base          | time-diff | Tag: <current>  | Tag: base  | memory-diff |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+
| benchLoad1Event ()                     | 935.100μs (±0.00%) | 992.800μs (±0.00%) | -5.81%    | 33.765mb        | 33.765mb   | 0.00%       |
| benchLoad10000Events ()                | 47.118ms (±0.00%)  | 49.372ms (±0.00%)  | -4.56%    | 33.765mb        | 33.765mb   | 0.00%       |
| benchSave1Event ()                     | 973.300μs (±0.00%) | 1.034ms (±0.00%)   | -5.91%    | 33.765mb        | 33.765mb   | 0.00%       |
| benchSave10000Events ()                | 212.836ms (±0.00%) | 212.065ms (±0.00%) | +0.36%    | 33.765mb        | 33.765mb   | 0.00%       |
| benchSave10000Aggregates ()            | 7.862s (±0.00%)    | 7.913s (±0.00%)    | -0.64%    | 33.765mb        | 33.765mb   | 0.00%       |
| benchSave10000AggregatesTransaction () | 4.702s (±0.00%)    | 4.681s (±0.00%)    | +0.45%    | 33.765mb        | 33.765mb   | 0.00%       |
+----------------------------------------+--------------------+--------------------+-----------+-----------------+------------+-------------+

This comment gets update everytime a new commit comes in!