Implement `VolumeSnapshotClass` for backup and restore

[wirwolf]

Portrate logic from other analog LVM drivers to this repo

https://github.com/aleofreddi/csi-sanlock-lvm/blob/master/conf/csi-sanlock-lvm-snapshotclass.yaml
https://github.com/openebs/lvm-localpv/blob/master/pkg/driver/controller.go#L462

[Gerrit91]

Thanks for creating this issue. We will transfer it to the successor of this project csi-driver-lvm.

[wirwolf]

Hello @Gerrit91. Any updates?

[Gerrit91]

Hi @wirwolf, the maintainers are currently busy and I can't tell you when it fits into the schedule. But the feature is on the wish list. If you want to accelerate the process, we are welcoming PRs and offer to review them.