implement locate and updatedb #1637

Job	Run time
cargo test (macOS-latest)	27s
cargo test (ubuntu-latest)	24s
cargo test (windows-latest)	8s
cargo clippy -- -D warnings	28s
cargo check (ubuntu-latest)	28s
cargo check (macOS-latest)	26s
cargo fmt --all -- --check	4s
cargo check (windows-latest)	9s
Code coverage (ubuntu-latest, nightly, --all-features)	1m 0s
	3m 34s

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