Added field for optional manifests (#209)

Signed-off-by: Frederic Giloux <[email protected]>

Author: fgiloux

crds/operators.coreos.com_installplans.yaml

@@ -222,6 +222,8 @@ spec:
                       - resource
                       - status
                     properties:
+                      optional:
+                        type: boolean
                       resolving:
                         type: string
                       resource: