CouchbaseScope

        CouchbaseScope represents a logical unit of data storage that sits between buckets and
collections e.g. a bucket may contain multiple scopes, and a scope may contain multiple
collections.  At present, scopes are not nested, so provide only a single level of
abstraction.  Scopes provide a coarser grained basis for role-based access control (RBAC)
and cross-datacenter replication (XDCR) than collections, but finer that buckets.
In order to be considered by the Operator, a scope must be referenced by either a
`CouchbaseBucket` or `CouchbaseEphemeralBucket` resource.