cdc: support EventFeedV2 RPC and introduce stream multiplexing

[hicqu]

What is changed and how it works?

Issue Number: Close #14967 .

What's Changed:

• TiCDCs send version and features headers to TiKVs when establishing a connection;
• add a new TiCDC feature stream multiplexing;

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

Check List

Tests

• Unit test
• Integration test

Side effects

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3pointer
• hi-rustin

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[hicqu]

/test

[hicqu]

/test

[hicqu]

/merge

[ti-chi-bot]

@hicqu: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and if the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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[ti-chi-bot]

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

Commit hash: 9703fc7

[hicqu]

/merge

[ti-chi-bot]

@hicqu: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and if the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

If you have any questions about the PR merge process, please refer to pr process.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

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

Commit hash: d7a5672