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 #47749 (0f4ca42) into master (aa453de) will increase coverage by 0.8999%.
Report is 2 commits behind head on master.
The diff coverage is 89.6551%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47749        +/-   ##
================================================
+ Coverage   71.8945%   72.7945%   +0.8999%     
================================================
  Files          1398       1421        +23     
  Lines        405142     411575      +6433     
================================================
+ Hits         291275     299604      +8329     
+ Misses        94250      93119      -1131     
+ Partials      19617      18852       -765     

Flag	Coverage Δ
integration	41.3896% <70.6896%> (?)
unit	71.8965% <89.6551%> (+0.0020%)	⬆️

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	48.6934% <ø> (-4.2479%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [AilinKid,hawkingrei]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-18 09:02:46.526157533 +0000 UTC m=+1820564.113267711: ☑️ agreed by hawkingrei.
• 2023-10-18 09:28:43.748427827 +0000 UTC m=+1822121.335537974: ☑️ agreed by AilinKid.

[qw4990]

/test check-dev2

[tiprow]

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

In response to this:

/test check-dev2

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #47763.

[qw4990]

/cherry-pick release-7.5

[ti-chi-bot]

@qw4990: new pull request created to branch release-7.5: #47872.

In response to this:

/cherry-pick release-7.5

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