owner(ticdc): Add support for region-label to enable meta-region isolation (#4937)

[ti-chi-bot]

This is an automated cherry-pick of #4937

What problem does this PR solve?

Issue Number: close #4756 close #4762
TiDB related issues, ref: pingcap/tidb#33665

What is changed and how it works?

1. Add new pdutil pkg to support region label
2. Verify meta-related label rules when init upstream

Check List

Tests

• Unit test
• Integration test

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity

Related changes

• Need to update the documentation

Release note

`Add support for region-label to enable meta-region isolation`

[ti-chi-bot]

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