Patroni: Enable pgbackrest backups and wal streaming

[conbrad]

Describe the task We currently just have a pgdump based backup process which is slow a non-incremental. Enabling pgbackrest backups based on wal streaming allows us to:

1. Have incremental backups
2. Allow spinning up a crunchy cluster based off the pgbackrest repo

Acceptance Criteria

• [x] Patroni runs pgbackrest backup wal streams to s3 bucket

Additional context

• Take a look at how to configure here: https://pgstef.github.io/2022/07/12/patroni_and_pgbackrest_combined.html
• Crunchy streaming standby docs: https://access.crunchydata.com/documentation/postgres-operator/5.3.1/tutorial/disaster-recovery/#standby-cluster

[conbrad]

We could also try this tool without having to do this extra step: https://github.com/shayonj/pg_easy_replicate