Add support for redis cluster replication group id definition

[joshAtRula]

what

The Cloudposse elasticache-redis module (https://github.com/cloudposse/terraform-aws-elasticache-redis/blob/main/main.tf#L92) references the ability to define a replication_group_id as a var, but we do not allow for that to be passed through from the reference module and submodule call.

why

In cases where the replication_group_id is not passed, the underlying code will attempt to create one. This can run into naming length limits (aws only allows a limit of 40 characters), so we should provide the ability to override it at all levels.

references

[mergify]

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