Add capability to reschedule and deny maintenance windows for Cloud SQL

[jackieoppia]

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Description

Right now there isn't a capability to use Terraform to reschedule or deny maintenance windows although these functionalities are available for Cloud SQL as shared on the GCP documentation . This would be helpful if the maintenance window is scheduled by default and needs to be managed by users who can only use Terraform.

New or Affected Resource(s)

Google Cloud SQL

Potential Terraform Configuration

References

https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/sql_database_instance