add path helper functions to lightclient #1156

Job	Run time
Build test artifacts	6m 7s
Reject trailing whitespace	8s
cargo-checkmate / Cache checkmate	7s
cargo-checkmate / Cargo checkmate (build)	6m 6s
cargo-checkmate / Cargo checkmate (check)	5m 1s
cargo-checkmate / Cargo checkmate (clippy)	4m 46s
cargo-checkmate / Cargo checkmate (doc)	7m 25s
cargo-checkmate / Cargo checkmate (format)	9s
Run tests (1)	8m 0s
Run tests (2)	5m 39s
Run tests (3)	5m 0s
Run tests (4)	6m 20s
Run tests (5)	7m 47s
Run tests (6)	6m 28s
Run tests (7)	3m 49s
Run tests (8)	5m 9s
	1h 18m 1s

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