Support for lsn capture to allow for custom replication setup #592
Description
I have a case where I am cloning the DB but need to retrieve the LSN on the cloned cluster to correctly setup the point of replication start.
It would be useful to be able to either run a generic query like https://registry.terraform.io/providers/ricochet1k/postgresql/latest/docs/data-sources/postgresql_query or have a custom LSN capture data source to get the latest LSN on a cloned cluster (either aurora_volume_logical_start_lsn or pg_current_wal_lsn or both)
Additionally, we could use the output to set pg_replication_origin_advance to the captured LSN.
Hopefully this is useful to others as well.