pkg/metrics: add a panel for sync mutex wait

[XuHuaiyu]

What problem does this PR solve?

Issue Number: ref #55390

Problem Summary:

What changed and how does it work?

Add a panel for sync mutex wait seconds.

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

[tiprow]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, wshwsh12

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-11 09:52:51.187013522 +0000 UTC m=+436440.927437462: ☑️ agreed by wshwsh12.
• 2024-09-11 09:52:59.535386365 +0000 UTC m=+436449.275810303: ☑️ agreed by hawkingrei.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.0802%. Comparing base (b095203) to head (9304343).
Report is 1 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56022         +/-   ##
=================================================
- Coverage   72.9081%   56.0802%   -16.8280%     
=================================================
  Files          1604       1729        +125     
  Lines        446718     622173     +175455     
=================================================
+ Hits         325694     348916      +23222     
- Misses       100968     249574     +148606     
- Partials      20056      23683       +3627     

Flag	Coverage Δ
integration	37.2360% <ø> (?)
unit	72.0229% <ø> (+0.0082%)	⬆️

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

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	52.8101% <ø> (+7.0793%)	⬆️