Process boarding location for linear platforms

[miklcct]

Summary

This adds the processing of boarding locations on linear platforms.

Explain in one or two sentences what this PR achieves.
Fixes #6056

Unit tests

TBC

Documentation

None

Bumping the serialization version id

Required. A new class is added into the graph.

[leonardehrenfried]

We talked about this today and we came to the conclusion that we want to introduce a data structure that is available during graph build only and then discarded. Lets discuss this in a meeting.

[miklcct]

Does moving the LinearPlatform field into StreetEdge and marking it as transient achieve the above, and avoid a serialisation bump?

[leonardehrenfried]

Unfortuntately not. We want to design a new system for keeping information that is used during graph build only and then discarded.

[codecov]

Codecov Report

Attention: Patch coverage is 64.00000% with 27 lines in your changes missing coverage. Please review.

Project coverage is 69.78%. Comparing base (684b841) to head (b445ab8).
Report is 1 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...aph_builder/module/OsmBoardingLocationsModule.java	42.85%	19 Missing and 5 partials ⚠️
.../opentripplanner/routing/linking/VertexLinker.java	57.14%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6247      +/-   ##
=============================================
- Coverage      69.79%   69.78%   -0.01%     
- Complexity     17786    17800      +14     
=============================================
  Files           2017     2020       +3     
  Lines          76042    76098      +56     
  Branches        7781     7784       +3     
=============================================
+ Hits           53073    53108      +35     
- Misses         20264    20285      +21     
  Partials        2705     2705              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[habrahamsson-skanetrafiken]

@t2gran will come with some suggestions of how to solve this without adding anything to the serialized graph.