provider/google: google_sql_database_instance doesn't set state in read

[hashibot]

This issue was originally opened by @paddycarver as hashicorp/terraform#15201. It was migrated here as part of the provider split. The original body of the issue is below.

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Like a lot of the older resources in the GCP provider, google_sql_database_instance only stores in state the properties that the user has defined in configs. This makes detecting drift unreliable, and also makes it impossible for us to support importing this resource type. We should update it to persist state from the API regardless of what is in the config.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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