When an OSD reaches OSD_NEARFULL state,
we have to manually increase the PVC volume claim
or manually increase the count of OSDs in the device set
Added a script auto-grow-storage.sh which will
i)automatically increase claim volume
ii)automatically add number of OSDs
Closes: https://github.com/rook/rook/issues/6101
Signed-off-by: parth-gr <paarora@redhat.com>