client: separate the TSO client implementation

[JmPotato]

What problem does this PR solve?

Issue Number: ref #8690.

What is changed and how does it work?

Separate the TSO client implementation.

Check List

Tests

• Unit test
• Integration test

Release note

None.

[codecov]

Codecov Report

Attention: Patch coverage is 93.54839% with 6 lines in your changes missing coverage. Please review.

Project coverage is 75.73%. Comparing base (21a04cb) to head (b923a9b).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8848      +/-   ##
==========================================
- Coverage   75.74%   75.73%   -0.02%     
==========================================
  Files         460      460              
  Lines       70693    70706      +13     
==========================================
  Hits        53547    53547              
- Misses      13761    13775      +14     
+ Partials     3385     3384       -1     

Flag	Coverage Δ
unittests	75.73% <93.54%> (-0.02%)	⬇️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: okJiang, rleungx

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Needs approval from an approver in each of these files:

• OWNERS [rleungx]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-26 06:55:09.498997778 +0000 UTC m=+533097.118652294: ☑️ agreed by rleungx.
• 2024-11-26 07:09:44.830182038 +0000 UTC m=+533972.449836551: ☑️ agreed by okJiang.

[JmPotato]

/test pull-integration-realcluster-test