* feat: use the new tenant-source api to atomically create the tenant and source in pg_replicate
* feat: use the new sink-pipeline api to atomically create the sink and pipeline in pg_replicate
* fix: remove some unused imports
* feat: use the new sink-pipeline api to atomically update the sink and pipeline in pg_replicate
* feat: deleting the sink cascades to delete the pipeline
* chore: update api types
* fix: revert accidental update to types
* remove unused code
* add a comment explaining why deleting only sink is enough