Aggregate Barman Cloud Plugin's ClusterRole to Kubernetes default user-facing roles

The Barman Cloud Plugin does not allow the aggregation labels, as does the CloudNativePG operator. I would expect to see the option `rbac.aggregateClusterRoles` in `values.yaml` and the labels `rbac.authorization.k8s.io/aggregate-to-view`, `rbac.authorization.k8s.io/aggregate-to-edit`, and `rbac.authorization.k8s.io/aggregate-to-admin` to be set for the Barman Cloud Plugin's ClusterRole so that a Kubernetes admin can manage ObjectStore resources.