feat(services/compfs): implement auxiliary functions #6711

Job	Run time
build-c-doc	19s
build-cpp-doc	1m 3s
build-dav-server-opendalfs-doc	41s
build-haskell-doc	10m 18s
build-java-doc	43s
build-lua-doc	10s
build-nodejs-doc	19s
build-object-store-opendal-doc	1m 6s
build-ocaml-doc	4m 33s
build-python-doc	2m 29s
build-rust-doc	6m 54s
build-website	2m 33s
	31m 8s

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