feat: Add `db_instance_role_association` functionality #314

Job	Run time
Collect workflow inputs	4s
Max TF pre-commit	3m 31s
Min TF pre-commit (.)	20s
Min TF pre-commit (./modules/db_subnet_group)	23s
Min TF pre-commit (./modules/db_instance_automated_backups_replication)	22s
Min TF pre-commit (./modules/db_instance)	23s
Min TF pre-commit (./modules/db_instance_role_association)	28s
Min TF pre-commit (./modules/db_parameter_group)	23s
Min TF pre-commit (./modules/db_option_group)	22s
Min TF pre-commit (./examples/replica-mysql)	24s
Min TF pre-commit (./examples/s3-import-mysql)	26s
Min TF pre-commit (./examples/replica-postgres)	20s
Min TF pre-commit (./examples/complete-mssql)	29s
Min TF pre-commit (./examples/groups)	25s
Min TF pre-commit (./examples/cross-region-replica-postgres)	22s
Min TF pre-commit (./examples/role-association-postgres)	31s
Min TF pre-commit (./examples/enhanced-monitoring)	27s
Min TF pre-commit (./examples/complete-mysql)	27s
Min TF pre-commit (./examples/complete-oracle)	28s
Min TF pre-commit (./examples/complete-postgres)	27s
	11m 2s

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