Export connectionName property of Cloud SQL instance

[evandbrown]

The Cloud SQL instance resource contains a connectionName property (https://cloud.google.com/sql/docs/mysql/admin-api/v1beta4/instances#resource) that is required when using the Cloud SQL proxy (https://cloud.google.com/sql/docs/mysql/sql-proxy) to connect to a DB instance. It would be helpful to read connectionName for this resource in Terraform so that it may be referenced.

Thanks!

[ghost]

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