Merge pull request #45994 from nmshelke/wip-55376-quincy

quincy: mgr/volumes: set, get, list and remove metadata of subvolume

Reviewed-by: Venky Shankar <vshankar@redhat.com>

diff --cc doc/cephfs/fs-volumes.rst
Simple merge

diff --cc qa/tasks/cephfs/test_volumes.py
Simple merge

diff --cc src/pybind/mgr/volumes/fs/operations/versions/metadata_manager.py
Simple merge