Cluster support

[scadu]

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Describe the Feature

Possibility to define db-cluster in the aws_db_event_subscription event_type, so the module would support both database instances and clusters.

Expected Behavior

Ability to set either (or both?) var.db_instance_id and (a new parameter var.db_cluster_id.
If any of those variables are set, the module subscribes to those events and create alerts accordingly.

Use Case

In real life, where alerting is the most needed, usually, RDS clusters are deployed and not single instances.

Describe Ideal Solution

A clear and concise description of what you want to happen. If you don't know, that's okay.

Actually, it's described in the Expected Behavior section.

Alternatives Considered

None, I guess.

Additional Context

An MR that wasn't finished -- #27. Maybe we could start from there, but I guess adding the new variable var.db_cluster_id used as input for aws_db_event_subscription would be sufficient. Happy to open MR once we have a clear vision of how it could be implemented.