planner: move more methods from StatsHandle to its sub-packages

[qw4990]

What problem does this PR solve?

Issue Number: ref #46905

Problem Summary: planner: move more methods from StatsHandle to its sub-packages

What is changed and how it works?

planner: move more methods from StatsHandle to its sub-packages

No logical change, just refactor.

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]

Hi @qw4990. Thanks for your PR.

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[codecov]

Codecov Report

Merging #47760 (ae8343d) into master (ac1f0d9) will increase coverage by 0.9103%.
Report is 4 commits behind head on master.
The diff coverage is 89.5522%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47760        +/-   ##
================================================
+ Coverage   71.8931%   72.8035%   +0.9103%     
================================================
  Files          1398       1421        +23     
  Lines        405200     411590      +6390     
================================================
+ Hits         291311     299652      +8341     
+ Misses        94269      93093      -1176     
+ Partials      19620      18845       -775     

Flag	Coverage Δ
integration	41.4957% <32.8358%> (?)
unit	71.8658% <89.5522%> (-0.0274%)	⬇️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	∅ <ø> (∅)
br	48.6844% <ø> (-4.2491%)	⬇️

[qw4990]

/test check-dev

[tiprow]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-18 13:47:23.280390347 +0000 UTC m=+1837640.867500491: ☑️ agreed by chrysan.
• 2023-10-19 06:18:01.536718393 +0000 UTC m=+1897079.123828538: ☑️ agreed by hawkingrei.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #47783.