Add backend supports for tso and scheduling

[rleungx]

The component name might be changed later. Ref #1651

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[codecov]

Codecov Report

Attention: Patch coverage is 3.42466% with 282 lines in your changes are missing coverage. Please review.

Project coverage is 23.67%. Comparing base (abee03e) to head (a86edef).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1648      +/-   ##
==========================================
- Coverage   24.08%   23.67%   -0.42%     
==========================================
  Files         173      177       +4     
  Lines       15754    16040     +286     
==========================================
+ Hits         3795     3798       +3     
- Misses      11675    11958     +283     
  Partials      284      284              

Flag	Coverage Δ
backend_integration	8.98% <3.67%> (-0.19%)	⬇️
backend_ut	26.17% <0.00%> (-0.13%)	⬇️

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[rleungx]

@mornyx PTAL

[baurine]

I will help review next week.

@rleungx , can you elaborate the PR when you're free, for example, how to build the dev env so I can test the PR, attach some screenshots. thanks~

[baurine]

test:

tiup playground nightly --pd.mode ms --pd.api 1 --pd.scheduling 1 --pd.tso 1 --pd.rm 0 --kv 3 --tiflash 0 --db 1

[baurine]

the code LGTM, let me test the compatibility with old version cluster

[baurine]

screenshot:

[baurine]

test compatibility, connect with tidb 7.5.0 cluster, reports following error in the cluster info page:

[baurine]

fix the following errors in commit: c0d1625 , after cherry-pick this commit, this PR is able to be approved.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: baurine

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-14 05:41:07.228163195 +0000 UTC m=+923294.250409579: ☑️ agreed by baurine.