domain: decouple info schema syncer

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #61702

Problem Summary:

What changed and how does it work?

in nextgen, we need to access system tables of SYSTEM keyspace from user keyspace, and need to load its schema to make sure we can use correct row ID allocator when do insert. this PR is the first part to impl it. most part are moving and abstracting code, see comments for where logic are change

• move schema validator into a separate pkg
• decouple info schema syncer from domain, and split the info schema loader from syncer.
• is in the code is the abbr for info schema

Check List

Tests

• [x] Unit test
• [ ] Integration test
• [x] Manual test (add detailed scripts or steps below)

run with real-tikv, and upgrade from older version, both success

• [ ] 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[bot]]

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 84.63542% with 118 lines in your changes missing coverage. Please review.

Project coverage is 75.2905%. Comparing base (6a12f31) to head (c8e7b75). Report is 17 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #61794        +/-   ##
================================================
+ Coverage   73.0660%   75.2905%   +2.2245%     
================================================
  Files          1730       1781        +51     
  Lines        481492     493403     +11911     
================================================
+ Hits         351807     371486     +19679     
+ Misses       108156      98923      -9233     
- Partials      21529      22994      +1465     

Flag	Coverage Δ
integration	49.1916% <55.8593%> (?)
unit	72.6353% <84.2242%> (+0.3346%)	:arrow_up:

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

Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	62.8979% <100.0000%> (+16.2107%)	:arrow_up:

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-06-19 03:01:36.341146851 +0000 UTC m=+327149.064325828: :ballot_box_with_check: agreed by tangenta.
• 2025-06-19 07:49:26.678058721 +0000 UTC m=+344419.401237699: :ballot_box_with_check: agreed by tiancaiamao.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Leavrth, tangenta, tiancaiamao

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Needs approval from an approver in each of these files:

• ~~OWNERS~~ [Leavrth,tangenta,tiancaiamao]
• ~~br/OWNERS~~ [Leavrth]
• ~~pkg/ddl/OWNERS~~ [tangenta]
• ~~pkg/domain/OWNERS~~ [tangenta]
• ~~pkg/infoschema/OWNERS~~ [tangenta]

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[D3Hunter]

/retest

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[D3Hunter]

/retest

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[D3Hunter]

/retest

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@D3Hunter: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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