Merge pull request #51708 from Matan-B/wip-48717-reef

reef: crimson/os: support multicore seastore

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

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

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

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

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

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

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