feat!: Divide flush and compaction job pool

[evenyag]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

closes #4868

What's changed and what's your intention?

This PR divides the job pool (scheduler) for flushes and compactions.

Now the max_background_jobs options are replaced with max_background_flushes, max_background_compactions and max_background_purges.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

Attention: Patch coverage is 70.73171% with 12 lines in your changes missing coverage. Please review.

Project coverage is 83.97%. Comparing base (5d42e63) to head (8cf9bd6).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4871      +/-   ##
==========================================
- Coverage   84.24%   83.97%   -0.27%     
==========================================
  Files        1131     1131              
  Lines      208879   208901      +22     
==========================================
- Hits       175976   175433     -543     
- Misses      32903    33468     +565     

[v0y4g3r]

Rest LGTM

[v0y4g3r]

LGTM