client: Support both sync and async interface for tsoStream, to avoid potential performane regression when concurrent RPC is not enabled

[MyonKeminta]

What problem does this PR solve?

Issue Number:

• Ref client: Support TSO RPC Parallelizing #8432
• Ref PR#56093 may cause 8.8% performance regression in benchmarksql pingcap/tidb#56103

What is changed and how does it work?

client: Support both sync and async interface for tsoStream, to avoid potential performane regression when concurrent RPC is not enabled

The issue pingcap/tidb#56103 reports a performance regression introduced by PR pingcap/tidb#56093 , which introduces #8483 to TiDB.

It's reasonable that this PR does have risk to introduce performance regression in non-current mode (which would be default after finishing #8432). However:

• After I rerun the failed bisect task twice, both of these reruns failed to reproduce the regression.
• According to the previously done microbench (mentioned here), the additional overhead introduced by that PR should not be that much.

So I think the performance regression report looks quite doubtful.

Anyway, I still prepared this PR: the tsoStream provides both sync and async interface. When concurrent RPC is not enabled, the sync interface will be used, making the logic the same as that before merging #8483 .

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

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[codecov]

Codecov Report

Attention: Patch coverage is 69.86301% with 22 lines in your changes missing coverage. Please review.

Project coverage is 77.66%. Comparing base (71f6f96) to head (16b59c7).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8636      +/-   ##
==========================================
+ Coverage   77.57%   77.66%   +0.09%     
==========================================
  Files         474      474              
  Lines       62033    62125      +92     
==========================================
+ Hits        48122    48251     +129     
+ Misses      10355    10313      -42     
- Partials     3556     3561       +5     

Flag	Coverage Δ
unittests	77.66% <69.86%> (+0.09%)	⬆️

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[ti-chi-bot]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456, multiple issues should use full syntax for each issue and be separated by a comma, like: Issue Number: close #123, ref #456.

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[ti-chi-bot]

@MyonKeminta: The following test 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-integration-realcluster-test	16b59c7	link	false	/test pull-integration-realcluster-test

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