Merge pull request #30077 from smithfarm/wip-40599-mimic

mimic: rgw_file: fix readdir eof() calc--caller stop implies !eof and introduce fast S3 Unix stats (immutable)

Reviewed-by: Casey Bodley <cbodley@redhat.com>

diff --cc src/common/legacy_config_opts.h
Simple merge

diff --cc src/common/options.cc
Simple merge

diff --cc src/rgw/rgw_file.cc
Simple merge

diff --cc src/rgw/rgw_file.h
Simple merge