`lscpu`: Read CPU information from `sysfs` #781

Job	Run time
cargo fmt --all -- --check	4s
cargo check (ubuntu-latest)	20s
cargo clippy -- -D warnings (ubuntu-latest)	20s
Code Coverage (ubuntu-latest, unix)	38s
cargo check (macOS-latest)	26s
cargo test (ubuntu-latest)	39s
cargo clippy -- -D warnings (macOS-latest)	38s
Code Coverage (macos-latest, macos)	57s
cargo test (macOS-latest)	40s
cargo check (windows-latest)	2m 36s
cargo clippy -- -D warnings (windows-latest)	21s
Code Coverage (windows-latest, windows)	38s
cargo test (windows-latest)	40s
	8m 57s

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