feat: Introduce db_cluster_secretsmanager_secret_arn output

[Pursu1tOfHapp1ness]

Description

Change introduces new output db_cluster_secretsmanager_secret_arn for current module.

Motivation and Context

While using ephemeral resource like aws_secretsmanager_secret_version, you need to specify ARN of the secret to proceed with desired solution for configuring RDS instance. Example:

ephemeral "aws_secretsmanager_secret_version" "example" {
  secret_id = data.aws_secretsmanager_secret.example.id
}

Now, current state of this module isn't provided anything, so you can't simply link ARN of the secret that is created by manage_master_user_password and manage_master_user_password_rotation fields and proceed with it. So, if module provides this functionality, we can simply use this output db_cluster_secretsmanager_secret_arn and use it for configuration needed providers (in my case, mysql provider).

Breaking Changes

No breaking changes, minor bump.

[bryantbiggs]

this is already available via the cluster_master_user_secret output

terraform-aws-rds-aurora/outputs.tf

Line 74 in 7a7e327

value = try(aws_rds_cluster.this[0].master_user_secret, null)

[github-actions]

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