slabtop: Add command #120

Job	Run time
cargo fmt --all -- --check	11s
cargo clippy -- -D warnings (ubuntu-latest)	18s
cargo check (ubuntu-latest)	18s
cargo clippy -- -D warnings (macOS-latest)	2m 24s
Code Coverage (ubuntu-latest, unix)	1m 52s
cargo check (macOS-latest)	1m 18s
cargo clippy -- -D warnings (windows-latest)	1m 16s
Code Coverage (macos-latest, macos)	3m 1s
cargo check (windows-latest)	1m 23s
cargo test (ubuntu-latest)	26s
cargo test (macOS-latest)	2m 43s
Code Coverage (windows-latest, windows)	5m 6s
cargo test (windows-latest)	1m 44s
	22m 0s

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