DM stand-alone dump/load mode and openapi sync stage statusr esponse improvement with TCP connection IO traffic statistics

[OliverS929]

What problem does this PR solve?

Issue Number: close #9230

What is changed and how it works?

This is a combined PR from #11749 and #11742, with openapi gen code conflict resolved.

Changes:

1. Add a stand-alone load mode to DM, alongside with dump mode
2. Add filed in dm/proto/dmworker.proto and regenerate by make generate-protobuf
3. Update openapi define and regenerate by make dm_generate_openapi
4. Init IO counter and uuid for the task created by openapi

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

Please refer to [Release Notes Language Style Guide](https://pingcap.github.io/tidb-dev-guide/contribute-to-tidb/release-notes-style-guide.html) to write a quality release note.

If you don't think this PR needs a release note then fill it with `None`.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign benmeadowcroft, d3hunter for approval, ensuring that each of them provides their approval before proceeding. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS
• dm/OWNERS
• dm/config/OWNERS
• engine/OWNERS

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 12 lines in your changes missing coverage. Please review.

Project coverage is 55.1633%. Comparing base (68c22f3) to head (d6d6eac).

Additional details and impacted files

Components	Coverage Δ
cdc	59.5667% <ø> (∅)
dm	50.0817% <68.5714%> (∅)
engine	53.2449% <0.0000%> (+0.0225%)	⬆️

Flag	Coverage Δ
unit	55.1633% <66.6666%> (+1.9410%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

@@               Coverage Diff                @@
##             master     #11754        +/-   ##
================================================
+ Coverage   53.2223%   55.1633%   +1.9410%     
================================================
  Files           213       1002       +789     
  Lines         17720     137430    +119710     
================================================
+ Hits           9431      75811     +66380     
- Misses         7686      56071     +48385     
- Partials        603       5548      +4945     

[ti-chi-bot]

@OliverS929: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-dm-integration-test	d6d6eac	link	true	/test dm-integration-test
pull-engine-integration-test	d6d6eac	link	true	/test engine-integration-test

Full PR test history. Your PR dashboard.

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