Merge pull request #59107 from nbalacha/wip-nbalacha-async-sorted-snaps

librbd: make "group snap list" async and optionally sorted by snap creation time

Reviewed-by: Ramana Raja <rraja@redhat.com>
Reviewed-by: Mykola Golub <mgolub@suse.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>

diff --cc src/librbd/CMakeLists.txt
Simple merge

diff --cc src/librbd/api/Group.cc
Simple merge

diff --cc src/test/librbd/test_Groups.cc
Simple merge