Merge PR #62003 into wip-vshankar-testing-20250325.080107-debug

* refs/pull/62003/head:
	test: add sanity and integration test for zerocopy
	cephfs client: add RW copy metrics
	libcephfs: expose zerocopy in libcephfs
	cephfs client: add zero-copy capabilit

diff --cc src/client/Client.cc
Simple merge

diff --cc src/client/Client.h
Simple merge

diff --cc src/include/cephfs/libcephfs.h
Simple merge

diff --cc src/libcephfs.cc
Simple merge