feat(sink): support `format plain encode avro` for kafka #17216

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Task	Status
I have written necessary rustdoc comments	Incomplete
I have added necessary unit tests and integration tests	Completed
I have added test labels as necessary. See details.	Incomplete
I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features #7934).	Incomplete
My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).	Incomplete
All checks passed in `./risedev check` (or alias, `./risedev c`)	Completed
My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)	Incomplete
My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)	Completed
Understand the implications of revoking this secret by investigating where it is used in your code.	Incomplete
Replace and store your secret safely. Learn here the best practices.	Incomplete
Revoke and rotate this secret.	Incomplete
If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.	Incomplete
following these best practices for managing and storing secrets including API keys and other credentials	Incomplete
install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.	Incomplete