Add component label for controllers and their CRDs

Label each controller deployment, service, service account and CRDs with `app.kubernetes.io/component: <controller-name>`.

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

manifests/bases/notification-controller/labels.yaml

@@ -0,0 +1,9 @@
+apiVersion: builtin
+kind: LabelTransformer
+metadata:
+  name: labels
+labels:
+  app.kubernetes.io/component: notification-controller
+fieldSpecs:
+  - path: metadata/labels
+    create: true