feat(sink): add madsim tests for coordinated sink

[wenym1]

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Highest Release Version: 2.3

What's changed and what's your intention?

Add madsim test for coordinated sink. Existing tests is fully reused.

For coordinated sink, the sink writers write data to a staging store with a handle id, and include the handle id as the sink metadata. When coordinator commits, it resolves the handle ids from sink metadata, retrieves staging data from staging store, and then add the staging data to the global store.

Checklist

• I have written necessary rustdoc comments.
• I have added necessary unit tests and integration tests.
• I have added test labels as necessary.
• I have added fuzzing tests or opened an issue to track them.
• My PR contains breaking changes.
• My PR changes performance-critical code, so I will run (micro) benchmarks and present the results.
• My PR contains critical fixes that are necessary to be merged into the latest release.

Documentation

• My PR needs documentation updates.

Release note

[wenym1]

• feat(sink): add madsim tests for coordinated sink #21214 👈 (View in Graphite)
• feat(sink): skip some epoch items to align initial coordinate epoch #21213
• feat(sink): return correct start epoch after scale for coupled coordinated sinks #21212
• main

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[wcy-fdu]

LGTM! Thanks for the efforts!
Sorry that I did not review in order. I reviewed this part first and will continue to review the previous two PRs later.

[BugenZhao]

It seems that integration test (madsim) - sink starts to fail stably (maybe OOM) since this PR. Would you help to investigate?

https://buildkite.com/risingwavelabs/main-cron/builds/4871#_