CouchbaseCollectionGroup

        CouchbaseCollectionGroup represent the finest grained size of data storage in Couchbase.
Collections contain all documents and indexes in the system.  Collections also form
the finest grain basis for role-based access control (RBAC) and cross-datacenter
replication (XDCR).  In order to be considered by the Operator, every collection group
must be referenced by a `CouchbaseScope` or `CouchbaseScopeGroup` resource.  Unlike the
CouchbaseCollection resource, a collection group represents multiple collections, with
common configuration parameters, to be expressed as a single resource, minimizing required
configuration and Kubernetes API traffic.  It also forms the basis of Couchbase RBAC
security boundaries.