feat: protect datanode with concurrency limit.

[lyang24]

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What's changed and what's your intention?

Adding query parallelism limit in region server to protect datanode from query overload.

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 98.11321% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (main@f73fb82). Learn more about missing BASE report.
Report is 28 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4699   +/-   ##
=======================================
  Coverage        ?   84.28%           
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  Files           ?     1117           
  Lines           ?   202686           
  Branches        ?        0           
=======================================
  Hits            ?   170841           
  Misses          ?    31845           
  Partials        ?        0           

[sunng87]

Remember to update config docs when we finalize the names

[sunng87]

LGTM

[evenyag]

Others LGTM

[v0y4g3r]

LGTM