br: mem dump when about to OOM

[Tristan1900]

What problem does this PR solve?

Issue Number: close #56971

Problem Summary:

What changed and how does it work?

Added a memory monitor that dumps the heap dump before it's about to OOM (reach 90% of mem), logs memory usage warning when reaching 80%.
Keeps only max 3 heap dumps so not spamming the disk
Generate only at 5 mins interval if needed
Output dir is configured though env and it should be persistent, default is /tmp/heapdump

Check List

Tests

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

  • I checked and no code files have been changed.

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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[codecov]

Codecov Report

Attention: Patch coverage is 48.29932% with 76 lines in your changes missing coverage. Please review.

Project coverage is 74.6834%. Comparing base (43f2fb9) to head (e66a0c0).

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #59234        +/-   ##
================================================
+ Coverage   73.0563%   74.6834%   +1.6270%     
================================================
  Files          1689       1706        +17     
  Lines        467012     467248       +236     
================================================
+ Hits         341182     348957      +7775     
+ Misses       104853      96549      -8304     
- Partials      20977      21742       +765     

Flag	Coverage Δ
integration	46.0037% <42.8571%> (?)
unit	72.2705% <23.1292%> (+0.0351%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	61.0620% <48.2993%> (+15.6017%)	⬆️