Add feature to resize PVC

[khanh96le]

If a PVC is running out of space, we usually need to expand the PVC size.

We can do it automatically by installing some external plugins like pvc-autoresizer, Kubernetes-Volume-Autoscaler
But if we don't, we need to edit the PVC to change the size parameter manually.
How about bringing that manual process into this tool?

Something like this: kubectl df-pv resize <pvc-name> 20Gi