Merge PR #19954 into master

Merge PR #19954 into master

* refs/pull/19954/head:
	test/encoding: refactor to avoid escaping shell magic
	mds: minor refactor of SimpleLock
	mds: track Capability in mempool
	mds: move CInode container members to mempool
	mds: move CDentry container members to mempool
	mds: move CDir container members to mempool
	mds: put MDSCacheObject compact_map in mempool
	common: use size_t for object size
	mds: convert to allocator agnostic string_view
	mds: simplify initialization
	compact_*: support mempool allocated containers

Reviewed-by: Zheng Yan <zyan@redhat.com>