Add backup Retention Settings to CloudSQLInstance

[danielinclouds]

What problem are you facing?

Currently, there is no way to control backup retention for CloudSQLInstance.

How could Crossplane help solve your problem?

I would like to control CloudSQLInstance backup retention settings. This feature is implemented in provider-jet-gcp here but it's missing in provider-gcp.

apiVersion: database.gcp.crossplane.io/v1beta1
kind: CloudSQLInstance
metadata:
  name: example-cloudsql-instance
spec:
  forProvider:
    databaseVersion: MYSQL_5_7
    region: us-west2
    settings:
      tier: db-custom-1-3840
      dataDiskSizeGb: 20
      backupConfiguration:
        backupRetentionSettings:
          retainedBackups: 7
          retentionUnit: "COUNT"
  providerConfigRef:
    name: example