client: Add benchmark for tsoStream and tsoDispatcher

[MyonKeminta]

What problem does this PR solve?

Issue Number: Ref #8432

What is changed and how does it work?

client: Add benchmark for tsoStream and tsoDispatcher

This PR adds some benchmarks that might be helpful for checking if there's any regression when working on #8432 .

Current result:

goos: linux
goarch: amd64
pkg: github.com/tikv/pd/client
cpu: Intel(R) Xeon(R) Silver 4214R CPU @ 2.40GHz
BenchmarkTSODispatcherHandleRequests-28           140149              7508 ns/op
BenchmarkTSOStreamSendRecv-28                    2788069               425.8 ns/op
PASS
ok      github.com/tikv/pd/client       2.796s

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.

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.60%. Comparing base (9af28fc) to head (ef6e365).
Report is 77 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8618      +/-   ##
==========================================
+ Coverage   77.48%   77.60%   +0.11%     
==========================================
  Files         472      474       +2     
  Lines       61798    61893      +95     
==========================================
+ Hits        47887    48032     +145     
+ Misses      10341    10317      -24     
+ Partials     3570     3544      -26     

Flag	Coverage Δ
unittests	77.60% <ø> (+0.11%)	⬆️

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[lhy1024]

please fix ci

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lhy1024

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-12 08:36:56.356713185 +0000 UTC m=+518286.097137144: ☑️ agreed by lhy1024.

[MyonKeminta]

Already included in #8483 .