feat(services/compfs): implement auxiliary functions #1102

Job	Run time
build_default_features (ubuntu-latest)	35s
build_all_platforms (ubuntu-latest)	2m 29s
build_under_wasm	41s
build_default_features (macos-latest)	36s
build_all_features	4m 5s
build_all_platforms (macos-latest)	2m 51s
build_default_features (windows-latest)	1m 19s
build_all_platforms (windows-latest)	4m 39s
check_clippy	3m 2s
check_docs	2m 53s
check_msrv	28s
unit	6m 3s
	29m 41s

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