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 #47679 (561579b) into master (4765838) will increase coverage by 0.9317%.
Report is 1 commits behind head on master.
The diff coverage is 75.7961%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47679        +/-   ##
================================================
+ Coverage   71.8952%   72.8269%   +0.9317%     
================================================
  Files          1396       1420        +24     
  Lines        405013     411503      +6490     
================================================
+ Hits         291185     299685      +8500     
+ Misses        94207      92983      -1224     
+ Partials      19621      18835       -786     

Flag	Coverage Δ
integration	41.3139% <62.4203%> (?)
unit	71.9338% <73.2484%> (+0.0385%)	⬆️

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	48.7132% <ø> (-4.2209%)	⬇️

[elsa0520]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elsa0520, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-17 02:09:31.436485399 +0000 UTC m=+1709369.023595549: ☑️ agreed by hawkingrei.
• 2023-10-17 02:13:08.516098987 +0000 UTC m=+1709586.103209128: ☑️ agreed by elsa0520.

[qw4990]

/test unit-test

[tiprow]

@qw4990: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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/test unit-test

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[hawkingrei]

/cherrypick release-7.5

[ti-chi-bot]

@hawkingrei: new pull request created to branch release-7.5: #47725.

In response to this:

/cherrypick release-7.5

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