ProvisionController support for SharedInformers

[zcahana]

Hi,

I'd like to propose extending the ProvisionController to optionally use SharedInformers instead of "private" informers. This will support use-cases where other application components (e.g., the Provisioner implementation) need to access PersistentVolumes / PersistentVolumeClaims / StorageClasses.

If this sounds relevant and reasonable, I'd be happy to work on that.

[wongma7]

yes, sounds good to me 👍