Add cluster parameters to the aws_rds role

[tymofiisobchenko]

Currently, we have the db_cluster_identifier parameter, which allows us to add instances to the cluster using the "amazon.aws.rds_instance" module, which though does not allow us to set a global cluster options, for example cluster parameter group, i.e. now a parameter group should be directly assigned to each cluster instance.

To manage RDS cluster parameters, we need to change the aws_rds role using amazon.aws.rds_cluster module