feat(cnpg-operator): Add PodMonitor as component

ref: #18

Author: jon-nfc

manifests/cloudnativepg-operator/components/metrics/PodMonitor-cnpg-controller-manager.yaml

@@ -0,0 +1,11 @@
+---
+apiVersion: monitoring.coreos.com/v1
+kind: PodMonitor
+metadata:
+  name: cnpg-controller-manager
+spec:
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: cloudnative-pg
+  podMetricsEndpoints:
+    - port: metrics

manifests/cloudnativepg-operator/components/metrics/kustomization.yaml

@@ -0,0 +1,7 @@
+---
+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+
+
+resources:
+  - PodMonitor-cnpg-controller-manager.yaml