feat(compaction): default new compaction group for new table

[Li0k]

I hereby agree to the terms of the RisingWave Labs, Inc. Contributor License Agreement.

What's changed and what's your intention?

after #18806

Since we introduced an automatic compaction group merge policy for hummock. Therefore, we can extend this by placing newly created tables into separate compaction groups for greater isolation.

1. The newly created table is isolated from the existing table.
2. after creation, the automated policy is re-scheduled based on the state of the group table.
3. when table creation fails, the data can be reclaimed by trivial-recliam, not coupled with the existing data.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added test labels as necessary. See details.
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
• All checks passed in ./risedev check (or alias, ./risedev c)
• My PR changes performance-critical code. (Please run macro/micro-benchmarks and show the results.)

• My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)

Documentation

• My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)

Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[Li0k]

Backfill-test

1. All mv are in new cg when creating

2. After backfill is completed, the mv with throughput will be merged

https://grafana.test.risingwave-cloud.xyz/d/EpkBw5W4k/risingwave-dev-dashboard?from=1729842851814&orgId=1&to=1729845715252&var-datasource=cdtasocg64074c&var-namespace=backfill-li0k-split-merge&var-instance=benchmark-risingwave&var-pod=All&var-component=All&var-table=All

[Li0k]

https://grafana.test.risingwave-cloud.xyz/d/EpkBw5W4k/risingwave-dev-dashboard?from=1730213227334&orgId=1&to=1730217206970&var-datasource=cdtasocg64074c&var-namespace=backfill-li0k-split-merge&var-instance=benchmark-risingwave&var-pod=All&var-component=All&var-table=All

Test with #19135

For the backfill test, all new tables are placed in the new CG and merged into cg 5 after the backfill is complete.

[zwang28]

LGTM