Merge pull request #59065 from YiteGu/wip-blk-discard-squid

squid: a series of optimizations for kerneldevice discard

diff --cc src/blk/BlockDevice.h
Simple merge

diff --cc src/blk/kernel/KernelDevice.cc
Simple merge

diff --cc src/common/options/global.yaml.in
Simple merge

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