mcs, tso: create global tso state view and apply to discovery, monitoring, etc.

[binshi-bing]

What problem does this PR solve?

Issue Number: Ref #5895

What is changed and how does it work?

Add registered TSO server watch loop to the TSO microservice

Check List

Tests

• Unit test

None.

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[codecov]

Codecov Report

Attention: Patch coverage is 76.47059% with 12 lines in your changes missing coverage. Please review.

Project coverage is 74.60%. Comparing base (6afbcec) to head (40b75d9).
Report is 799 commits behind head on master.

Files	Patch %	Lines
pkg/tso/keyspace_group_manager.go	75.51%	9 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6525      +/-   ##
==========================================
+ Coverage   74.57%   74.60%   +0.02%     
==========================================
  Files         417      417              
  Lines       42896    42949      +53     
==========================================
+ Hits        31990    32040      +50     
+ Misses       8079     8078       -1     
- Partials     2827     2831       +4     

Flag	Coverage Δ
unittests	74.60% <76.47%> (+0.02%)	⬆️

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[ti-chi-bot]

PR needs rebase.

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