sink(ticdc): add transaction-atomicity parameter to SinkURI (#6038)

[ti-chi-bot]

This is an automated cherry-pick of #6038

What problem does this PR solve?

Issue Number: ref #5231

What is changed and how it works?

1. Add transaction-atomicity parameter to SinkURI
2. Use validateAndAdjust method to parse and verify sinkURI's parameters uniformly.
3. Add splitTxn field to flowController to accommodate different transaction atomicity.
4. Add defensive checks in sinkNode.

Check List

Tests

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

Questions

Will it cause performance regression or break compatibility?

No

Do you need to update user documentation, design documentation or monitoring documentation?

Yes

Release note

`None`.

[ti-chi-bot]

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[nongfushanquan]

/run-all-tests

[amyangfei]

/merge

[ti-chi-bot]

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

Commit hash: 5b94051

[CharlesCheung96]

/run-verify
/run-unit-test

[CharlesCheung96]

/run-verify