api(ticdc): refactor api packages

[sdojjy]

What problem does this PR solve?

Issue Number: close #5551

What is changed and how it works?

refactor api directory

Check List

Tests

• Unit test
• Integration test

Release note

 `None`.

[ti-chi-bot]

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• asddongmen
• hi-rustin

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[sdojjy]

/run-all-tests

[sdojjy]

/run-all-tests

[Rustin170506]

What does private mean? It confuses me. Also I prefer to move the validator into validator package instead of util.

[sdojjy]

What does private mean? It confuses me. Also I prefer to move the validator into validator package instead of util.

private means not an open API, what's your suggestion?

[Rustin170506]

rest LGTM

[asddongmen]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 7f36046

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