Add partial implementation of `lslocks` #830

Job	Run time
Code Coverage (ubuntu-latest, unix)	1m 50s
cargo check (ubuntu-latest)	25s
Code Coverage (macos-latest, macos)	1m 42s
cargo clippy -- -D warnings (ubuntu-latest)	25s
cargo check (macOS-latest)	32s
Code Coverage (windows-latest, windows)	4m 44s
cargo fmt --all -- --check	12s
cargo clippy -- -D warnings (macOS-latest)	25s
cargo check (windows-latest)	1m 42s
cargo clippy -- -D warnings (windows-latest)	1m 30s
cargo test (ubuntu-latest)	37s
cargo test (macOS-latest)	38s
cargo test (windows-latest)	2m 21s
	17m 3s

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