Rust

imp: Enable custom paths for light client proof verifications #371

Job	Run time
nightly_fmt	20s
clippy_all_features	1m 9s
clippy_no_default_features	1m 7s
Check features	19m 45s
doc_all_features	2m 15s
doc_no_default_features	2m 17s
test-msrv (ubuntu-latest, unknown-linux-gnu)	3m 16s
test-stable	2m 15s
test-msrv (macos-latest, apple-darwin)	4m 56s
	37m 20s

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