client/tso: decouple tsoClient and tsoDispatcher

[JmPotato]

What problem does this PR solve?

Issue Number: ref #8047.

What is changed and how does it work?

- Decouple `tsoClient` and `tsoDispatcher` to appropriately categorize different methods.
- Update `connectionCtxsUpdater` to support the Local TSO.

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• rleungx

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[codecov]

Codecov Report

Attention: Patch coverage is 89.36877% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 77.37%. Comparing base (6e3cac7) to head (0dbd932).
Report is 1 commits behind head on master.

❗ Current head 0dbd932 differs from pull request most recent head 7d3dae8. Consider uploading reports for the commit 7d3dae8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8134      +/-   ##
==========================================
+ Coverage   77.33%   77.37%   +0.03%     
==========================================
  Files         471      471              
  Lines       61295    61317      +22     
==========================================
+ Hits        47405    47445      +40     
+ Misses      10319    10301      -18     
  Partials     3571     3571              

Flag	Coverage Δ
unittests	77.37% <89.36%> (+0.03%)	⬆️

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[JmPotato]

/merge

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 7d3dae8