*: decouple the scheduler and checker interfaces

[rleungx]

What problem does this PR solve?

Issue Number: Ref #5839.

What is changed and how does it work?

The PR makes the interface usage more clear. SchedulerCluster represents the methods that the schedulers need. CheckerCluster represents the methods that the checkers need. SharedCluster represents the methods that both schedulers and checkers need. The definitions are the same as config.

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• nolouch

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[rleungx]

@nolouch @JmPotato PTAL

[nolouch]

lgtm

[rleungx]

/merge

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[ti-chi-bot]

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

Commit hash: a2cda87

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@rleungx: Your PR was out of date, I have automatically updated it for you.

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[codecov]

Codecov Report

Merging #6776 (476c126) into master (c8f88e4) will increase coverage by 0.12%.
The diff coverage is 81.57%.

❗ Current head 476c126 differs from pull request most recent head 37a653a. Consider uploading reports for the commit 37a653a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6776      +/-   ##
==========================================
+ Coverage   74.17%   74.29%   +0.12%     
==========================================
  Files         413      413              
  Lines       43406    43178     -228     
==========================================
- Hits        32196    32080     -116     
+ Misses       8334     8236      -98     
+ Partials     2876     2862      -14     

Flag	Coverage Δ
unittests	74.29% <81.57%> (+0.12%)	⬆️

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