r/db_instance: add backup_replication

[davegallant]

This adds a backup_replication block (as mentioned in the original issue) that enables automatic backups to be replicated to a destination_region.

AWS Docs: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ReplicateBackups.html#AutomatedBackups.Replicating.Enable

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Closes #20606

Output from acceptance testing:

$ make testacc TESTS='TestAccRDSInstance_backupReplication_basic' PKG=rds
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 20 -run='TestAccRDSInstance_backupReplication_basic'  -timeout 180m
=== RUN   TestAccRDSInstance_backupReplication_basic
=== PAUSE TestAccRDSInstance_backupReplication_basic
=== CONT  TestAccRDSInstance_backupReplication_basic
--- PASS: TestAccRDSInstance_backupReplication_basic (651.87s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/rds        651.910s

[github-actions]

Welcome @davegallant 👋

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[davegallant]

This was implemented as a separate resource: #23759

[github-actions]

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