ddl: support fine-grained modify column and add column

[okJiang]

What problem does this PR solve?

Issue Number: close #48519

Problem Summary:

What changed and how does it work?

• support modify column default value and comment
• support add column nullable or not null with default value
• change admin set bdr role local_only to admin unset bdr role

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

[tangenta]

Rest LGTM

[okJiang]

/retest

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-05 02:58:34.825536794 +0000 UTC m=+2398605.862763718: ☑️ agreed by tangenta.
• 2024-01-05 03:15:07.753085146 +0000 UTC m=+2399598.790312074: ☑️ agreed by asddongmen.

[easonn7]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: asddongmen, easonn7, tangenta

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Needs approval from an approver in each of these files:

• OWNERS [asddongmen,tangenta]
• pkg/ddl/OWNERS [tangenta]
• pkg/meta/OWNERS [tangenta]
• pkg/parser/OWNERS [easonn7,tangenta]

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