Helm Chart should create VolumeSnapshotClass as well.

[rbo]

Is your feature request related to a problem?/Why is this needed

If you deploy csi-driver-nfs with:

externalSnapshotter:
  enabled: true

It should roll out an VolumeSnapshotClass as well.

---
apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshotClass
metadata:
  name: csi-nfs-snapclass
driver: nfs.csi.k8s.io
deletionPolicy: Delete

As described in the deployment: https://github.com/kubernetes-csi/csi-driver-nfs/blob/master/deploy/example/snapshot/snapshotclass-nfs.yaml

Describe the solution you'd like in detail

Describe alternatives you've considered

Additional context

[geoffrey1330]

Could you please assign this to me

[andyzhangx]

/assign @geoffrey1330