`lscpu`: Support extracting and outputting nested fields #776

Job	Run time
cargo fmt --all -- --check	6s
cargo check (ubuntu-latest)	23s
cargo check (macOS-latest)	28s
Code Coverage (ubuntu-latest, unix)	1m 7s
cargo clippy -- -D warnings (ubuntu-latest)	27s
cargo check (windows-latest)	2m 36s
Code Coverage (macos-latest, macos)	51s
cargo test (ubuntu-latest)	37s
Code Coverage (windows-latest, windows)	49s
cargo clippy -- -D warnings (macOS-latest)	31s
cargo test (macOS-latest)	46s
cargo clippy -- -D warnings (windows-latest)	2m 41s
cargo test (windows-latest)	49s
	12m 11s

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