Added reclaimPolicy setting via helm value for every StorageClasses

[vfrans]

• Changed Volume Storage class reclaim policy to be settable via helm value.
• Added Files Storage class reclaim policy and made it settable
• Added Dynamic Files Storage class reclaim policy and made it settable
• Updated doc

One thing to note is that I don't know the capabilities of the nutanix-csi implementation in terms of reclaimPolicy support. I assumed here that all 3 SC supported reclaimPolicy of at least "Delete" (the default for dynamically generated PVs) but that's up to the implementation of the CSI as per https://kubernetes.io/docs/concepts/storage/persistent-volumes/#delete states it.

[tuxtof]

concerning reclaimPolicy support The Recycle reclaim policy is deprecated. Instead, the recommended approach is to use dynamic provisioning which is the goal of the Nutanix CSI