[WIP] ddl: DM's schema tracker as DDL implementation

[lance6716]

What problem does this PR solve?

Issue Number: close #35933

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 code

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

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Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/b3e54e18dcc7d146351351d4345303aeaaa8ca57

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[lance6716]

question to reviewer

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@lance6716: PR needs rebase.

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