Allow contractimpls across mods #4211

Job	Run time
cargo-deny (advisories)	37s
fmt	12s
cargo-deny (bans licenses sources)	36s
build-fuzz	2m 49s
check-git-rev-deps	14s
build-and-test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	7m 52s
build-and-test (msrv, ubuntu-latest, aarch64-unknown-linux-gnu, true)	4m 35s
docs	4m 38s
build-and-test (msrv, windows-latest, x86_64-pc-windows-msvc)	15m 30s
semver-checks	5m 35s
readme	2m 46s
build-and-test (latest, ubuntu-latest, x86_64-unknown-linux-gnu)	12m 21s
build-and-test (latest, ubuntu-latest, aarch64-unknown-linux-gnu, true)	4m 19s
publish-dry-run	0s
build-and-test (latest, windows-latest, x86_64-pc-windows-msvc)	14m 58s
complete	1s
	1h 17m 3s

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