timer: refactor timer runtime metrics to make it more flexible to use

[lcwangchao]

What problem does this PR solve?

Issue Number: close #45610

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

[codecov]

Codecov Report

Merging #45644 (020edbc) into master (ac0c90e) will increase coverage by 0.5029%.
Report is 15 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #45644        +/-   ##
================================================
+ Coverage   73.2228%   73.7258%   +0.5029%     
================================================
  Files          1273       1277         +4     
  Lines        390068     395221      +5153     
================================================
+ Hits         285619     291380      +5761     
+ Misses        86148      85648       -500     
+ Partials      18301      18193       -108     

Flag	Coverage Δ
integration	78.1388% <ø> (?)
unit	73.7182% <100.0000%> (+0.4954%)	⬆️

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

Components	Coverage Δ
dumpling	54.0444% <ø> (ø)
parser	85.0417% <ø> (-0.0109%)	⬇️
br	52.8639% <ø> (+0.7139%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-07-28 06:29:03.011694131 +0000 UTC m=+508685.606225118: ☑️ agreed by hawkingrei.
• 2023-07-31 04:27:30.805416316 +0000 UTC m=+73134.747764845: ☑️ agreed by YangKeao.