Add UID of Zalando Resource to our Postgres Resource #127
Description
The UID of the Zalando Resource is e.g. heavily used for backups (and thus in folder names in the configured S3 buckets).
However, the end user currently has no means to obtain this UID via the cloud-api.
As we already update the Status and the Service IP+Port in the Status Controller, we should extend this logic to also provide the UID of the Zalando Resource in the Status of our Resource.
cloud-api/cloudctl needs to be updated as well.