Add (unit) list utillity functions #1354

Job	Run time
WASM version	2m 5s
Ensure 'cargo fmt' has been run	14s
Extract crate metadata	4s
Documentation checks	6m 13s
Minimum supported rust version	1m 55s
aarch64-unknown-linux-gnu (ubuntu-20.04)	3m 56s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	3m 38s
arm-unknown-linux-musleabihf (ubuntu-20.04)	3m 51s
i686-pc-windows-msvc (windows-2019)	5m 45s
i686-unknown-linux-gnu (ubuntu-20.04)	3m 59s
i686-unknown-linux-musl (ubuntu-20.04)	3m 43s
x86_64-apple-darwin (macos-12)	4m 49s
x86_64-pc-windows-msvc (windows-2019)	6m 22s
x86_64-unknown-linux-gnu (ubuntu-20.04)	3m 29s
x86_64-unknown-linux-musl (ubuntu-20.04)	3m 47s
	53m 50s

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