infoschema: split InfoSchemaMisc from InfoSchema interface

[tiancaiamao]

What problem does this PR solve?

Issue Number: ref #50959

Problem Summary:

What changed and how does it work?

Split the InfoSchema into two, the core APIs and InfoSchemaMisc.
In InfoSchemaV2, we'll still use the same InfoSchemaMisc implementation.
This cleanup is a furthur step to make our InfoSchemaV2 easier.

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.

No functional changes.

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 @tiancaiamao. Thanks for your PR.

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[codecov]

Codecov Report

Merging #51015 (647ca78) into master (f5e0799) will increase coverage by 0.3712%.
Report is 1 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51015        +/-   ##
================================================
+ Coverage   72.2813%   72.6525%   +0.3712%     
================================================
  Files          1467       1467                
  Lines        361854     434915     +73061     
================================================
+ Hits         261553     315977     +54424     
- Misses        80989      99008     +18019     
- Partials      19312      19930       +618     

Flag	Coverage Δ
integration	49.2099% <91.6666%> (?)
unit	70.3058% <100.0000%> (-1.8496%)	⬇️

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

Components	Coverage Δ
dumpling	54.1120% <ø> (-2.3651%)	⬇️
parser	∅ <ø> (∅)
br	51.2942% <ø> (+5.0077%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lcwangchao, ywqzzy

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-07 02:48:11.220392511 +0000 UTC m=+325016.787162401: ☑️ agreed by lcwangchao.
• 2024-02-07 05:36:41.927223962 +0000 UTC m=+335127.493993849: ☑️ agreed by ywqzzy.