doc: add rfc for resource manage

[hawkingrei]

What problem does this PR solve?

Issue Number: close #41184

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

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[Benjamin2037]

Suggested change

	affecting queries.
	cause an observerable impact to database foreground workload CPU usage( eg. TP and AP workload)

[Benjamin2037]

Currently, add a column is general DDL, it only change table meta data, will not cause high CPU usage.

[codecov]

Codecov Report

Merging #39809 (ff6edfd) into master (1d2040a) will increase coverage by 6.0992%.
Report is 3626 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #39809        +/-   ##
================================================
+ Coverage   73.6556%   79.7549%   +6.0992%     
================================================
  Files          1129       3577      +2448     
  Lines        360017    1044333    +684316     
================================================
+ Hits         265173     832907    +567734     
- Misses        77743     172685     +94942     
- Partials      17101      38741     +21640     

[tiprow]

@hawkingrei: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
tiprow_fast_test	ff6edfd	link	true	/test fast_test_tiprow

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[ti-chi-bot]

@hawkingrei: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-br-integration-test	ff6edfd	link	true	/test pull-br-integration-test

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