add vpa to controller

deploy/example/vpa/README.md

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+# Vertical pod autoscaler to Azure disk CSI controller pods
+## Prerequisites: install vertical pod autoscaler
+You should install Vertical Pod Autoscaler first, please refer to the [vertical-pod-autoscaler](https://github.com/kubernetes/autoscaler/blob/master/vertical-pod-autoscaler/README.md)
+
+## Create a VPA corresponding to CSI controller deployment
+> create a VPA for CSI controller
+```console
+kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/azuredisk-csi-driver/master/deploy/example/vpa/vertical-pod-autoscaler.yaml
+```
+> check the VPA config and current recomended resource requests
+```
+kubectl get vpa -n kube-system
+NAME                       MODE   CPU   MEM        PROVIDED   AGE
+csi-azuredisk-controller   Auto   15m   43690666   True       8s
+
+kubectl describe vpa csi-azuredisk-controller -n kube-system
+Name:         csi-azuredisk-controller
+Namespace:    kube-system
+Labels:       <none>
+Annotations:  <none>
+API Version:  autoscaling.k8s.io/v1
+Kind:         VerticalPodAutoscaler
+Metadata:
+  Creation Timestamp:  2024-09-25T02:54:36Z
+  Generation:          1
+  Resource Version:    417864
+  UID:                 6c393ae3-2f17-4efe-974c-2f0d1f4c635a
+Spec:
+  Resource Policy:
+    Container Policies:
+      Container Name:  *
+      Max Allowed:
+        Cpu:     15m
+        Memory:  50Gi
+  Target Ref:
+    API Version:  apps/v1
+    Kind:         Deployment
+    Name:         csi-azuredisk-controller
+  Update Policy:
+    Update Mode:  Auto
+Status:
+  Conditions:
+    Last Transition Time:  2024-09-25T02:55:13Z
+    Status:                True
+    Type:                  RecommendationProvided
+  Recommendation:
+    Container Recommendations:
+      Container Name:  azuredisk
+      Lower Bound:
+        Cpu:     10m
+        Memory:  43690666
+      Target:
+        Cpu:     15m
+        Memory:  43690666
+      Uncapped Target:
+        Cpu:     23m
+        Memory:  43690666
+      Upper Bound:
+        Cpu:           15m
+        Memory:        55999064
+      Container Name:  csi-attacher
+      Lower Bound:
+        Cpu:     10m
+        Memory:  43690666
+      Target:
+        Cpu:     11m
+        Memory:  43690666
+      Uncapped Target:
+        Cpu:     11m
+        Memory:  43690666
+      Upper Bound:
+        Cpu:           15m
+        Memory:        86115636
+      Container Name:  csi-provisioner
+      Lower Bound:
+        Cpu:     10m
+        Memory:  43690666
+      Target:
+        Cpu:     11m
+        Memory:  43690666
+      Uncapped Target:
+        Cpu:     11m
+        Memory:  43690666
+      Upper Bound:
+        Cpu:           15m
+        Memory:        55999064
+      Container Name:  csi-resizer
+      Lower Bound:
+        Cpu:     10m
+        Memory:  43690666
+      Target:
+        Cpu:     11m
+        Memory:  43690666
+      Uncapped Target:
+        Cpu:     11m
+        Memory:  43690666
+      Upper Bound:
+        Cpu:           15m
+        Memory:        55999064
+      Container Name:  csi-snapshotter
+      Lower Bound:
+        Cpu:     10m
+        Memory:  43690666
+      Target:
+        Cpu:     11m
+        Memory:  43690666
+      Uncapped Target:
+        Cpu:     11m
+        Memory:  43690666
+      Upper Bound:
+        Cpu:           15m
+        Memory:        55999064
+      Container Name:  liveness-probe
+      Lower Bound:
+        Cpu:     10m
+        Memory:  43690666
+      Target:
+        Cpu:     11m
+        Memory:  43690666
+      Uncapped Target:
+        Cpu:     11m
+        Memory:  43690666
+      Upper Bound:
+        Cpu:     15m
+        Memory:  43690666
+Events:          <none>
+```

deploy/example/vpa/vertical-pod-autoscaler.yaml

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+apiVersion: autoscaling.k8s.io/v1
+kind: VerticalPodAutoscaler
+metadata:
+  name: csi-azuredisk-controller
+  namespace: kube-system
+spec:
+  targetRef:
+    apiVersion: "apps/v1"
+    kind: Deployment
+    name: csi-azuredisk-controller
+  updatePolicy:
+    updateMode: "Auto"
+  resourcePolicy: 
+    containerPolicies:
+    - containerName: '*'
+      maxAllowed:
+        cpu: 15m
+        memory: 50Gi