Merge pull request #31041 from liu-chunmei/ceph_seastar_alien_blue_store

crimson:: add alien blue store

Reviewed-by: Samuel Just <sjust@redhat.com>
Reviewed-by: Kefu Chai <kchai@redhat.com>

diff --cc src/crimson/osd/osd.cc
Simple merge

diff --cc src/crimson/osd/pg.h
Simple merge

diff --cc src/mon/Monitor.cc
Simple merge

diff --cc src/os/bluestore/BlueFS.cc
Simple merge