Seperate RawKV region and TiDB regions

[haojinming]

Feature Request

Is your feature request related to a problem? Please describe:

When run tikv-cdc, the resolved-ts would be mixed if there are rawkv data and tidb data in one same region.
PD provides functionality to seperate regions with a specified key.
Please ref:
tikv/pd#3839
https://github.com/pingcap/tiflow/blob/release-5.4/pkg/pdutil/region_label.go

TiKV-CDC should also implement this.

Describe the feature you'd like:

Seperate rawkv and tidb regions.

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy:

[haojinming]

@overvenus @pingyu PTAL~

[github-actions]

This issue is stale because it has been open 30 days with no activity.

[github-actions]

This issue is stale because it has been open 30 days with no activity.