mcs: support hotspot http interface in scheduling server

[lhy1024]

What problem does this PR solve?

Issue Number: Ref #5839

TODO:

1. need to support to forward bucket request to scheduling server
2. need to support history hot region in scheduling server

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• nolouch
• rleungx

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[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[lhy1024]

/test all

[codecov]

Codecov Report

Merging #7184 (0688c33) into master (d0193d0) will increase coverage by 0.08%.
The diff coverage is 70.23%.

❗ Current head 0688c33 differs from pull request most recent head ebc0c22. Consider uploading reports for the commit ebc0c22 to get more accurate results

@@            Coverage Diff             @@
##           master    #7184      +/-   ##
==========================================
+ Coverage   74.58%   74.66%   +0.08%     
==========================================
  Files         442      442              
  Lines       47681    47726      +45     
==========================================
+ Hits        35565    35637      +72     
+ Misses       8990     8951      -39     
- Partials     3126     3138      +12     

Flag	Coverage Δ
unittests	74.66% <70.23%> (+0.08%)	⬆️

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[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: 71423b0

[ti-chi-bot]

@lhy1024: Your PR was out of date, I have automatically updated it for you.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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