statistics: move StatsUsage and TableDelta into new package

[hawkingrei]

What problem does this PR solve?

Issue Number: ref #46905

Problem Summary:

What is changed and how it works?

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

[codecov]

Codecov Report

Merging #47238 (403134c) into master (df76319) will decrease coverage by 0.2893%.
Report is 12 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47238        +/-   ##
================================================
- Coverage   72.9671%   72.6778%   -0.2893%     
================================================
  Files          1340       1363        +23     
  Lines        400269     406689      +6420     
================================================
+ Hits         292065     295573      +3508     
- Misses        89270      92299      +3029     
+ Partials      18934      18817       -117     

Flag	Coverage Δ
integration	33.3727% <13.7931%> (?)
unit	72.9168% <100.0000%> (-0.0503%)	⬇️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	84.9340% <ø> (-0.0036%)	⬇️
br	48.7531% <ø> (-4.3276%)	⬇️

[qw4990]

/retest-required

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hi-rustin, qw4990

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-25 07:46:48.826873631 +0000 UTC m=+260998.545215848: ☑️ agreed by qw4990.
• 2023-09-25 13:03:10.589333142 +0000 UTC m=+279980.307675368: ☑️ agreed by hi-rustin.

[hawkingrei]

/retest