Is this a bug report or feature request?

• Feature Request

With the Ceph Pacific release, CephFS will support asynchronous replication of snapshots to a remote CephFS file system via cephfs-mirror tool. Snapshots are synchronized by mirroring snapshot data followed by creating a snapshot with the same name (for a given directory on the remote file system) as the snapshot being synchronized.

Rook should implement a similar CRD to the CephRBDMirror, like CephFilesystemMirror.

For more details about the feature: https://docs.ceph.com/en/latest/dev/cephfs-mirroring/

What should the feature do:

Implement a new CephFilesystem CRD so that mirroring between filesystems can be achieved.

What is use case behind this feature:

Disaster recovery.

Environment: