We can now enable via the cluster CR any manager module with a
setting under the new mgr element

mgr:
  modules:
  - name: pg_autoscaler
    enabled: true
Co-authored-by: Sébastien Han <seb@redhat.com>
Co-authored-by: travisn <tnielsen@redhat.com>
Signed-off-by: travisn <tnielsen@redhat.com>