implement bls12-381 functions (#1345) #4316

Job	Run time
build-fuzz	3m 39s
cargo-deny (advisories)	39s
build-and-test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	14m 43s
cargo-deny (bans licenses sources)	42s
check-git-rev-deps	9s
build-and-test (msrv, ubuntu-latest, aarch64-unknown-linux-gnu, true)	8m 35s
build-and-test (msrv, windows-latest, x86_64-pc-windows-msvc)	20m 49s
docs	6m 5s
build-and-test (latest, ubuntu-latest, x86_64-unknown-linux-gnu)	13m 45s
fmt	9s
build-and-test (latest, ubuntu-latest, aarch64-unknown-linux-gnu, true)	8m 39s
build-and-test (latest, windows-latest, x86_64-pc-windows-msvc)	19m 28s
readme	5m 35s
semver-checks	5m 44s
publish-dry-run (ubuntu-latest, wasm32-unknown-unknown) / publish-dry-run / publish-dry-run	21s
publish-dry-run (ubuntu-latest, x86_64-unknown-linux-gnu, --feature-powerset --exclude-features d... / publish-dry-run / publish-dry-run	13s
complete	1s
	1h 49m 16s

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