[TASK] Implementation for FerretDB on top of CNPG Cluster

[khatrivarun]

Objectives:

• Implementation for FerretDB on top of CNPG Cluster
• There's a seperate image to be used for PostgreSQL which uses DocumentDB Extension, use that with CNPG as an extension
• Configure Backups on S3, Read Replicas, TLS connections and Network Policies for the deployment