RDS DBInstance automated backup cross-region replication

[jtgorny]

New functionality not based on any open issues (that I could find) to enable cross-region replication on automated backups.

I've looked into the backupTarget and that is an inadequate solution as it only allows you to store backups in the current region your RDS DBInstance is running in.

Relevant APIs:

• https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_StartDBInstanceAutomatedBackupsReplication.html
• https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_StopDBInstanceAutomatedBackupsReplication.html

[github-actions]

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