Add partial implementation of `lslocks` #832

Job	Run time
cargo fmt --all -- --check	12s
cargo check (ubuntu-latest)	24s
cargo clippy -- -D warnings (ubuntu-latest)	26s
cargo check (macOS-latest)	25s
Code Coverage (ubuntu-latest, unix)	1m 55s
cargo clippy -- -D warnings (macOS-latest)	36s
cargo test (ubuntu-latest)	35s
cargo check (windows-latest)	1m 50s
Code Coverage (macos-latest, macos)	1m 54s
cargo clippy -- -D warnings (windows-latest)	1m 58s
Code Coverage (windows-latest, windows)	6m 7s
cargo test (macOS-latest)	47s
cargo test (windows-latest)	2m 4s
	19m 13s

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