Tests

Chore: some no_std cleanup (#1834) #12

Job	Run time
check no_std	28s
check	24s
check no_std kzg-rs	33s
clippy	1m 11s
check serde	26s
check std	27s
docs	1m 8s
test stable --no-default-features	51s
fmt	13s
test stable	57s
TyposCheck	6s
test stable --all-features	1m 26s
test beta --no-default-features	55s
test beta	58s
test beta --all-features	1m 17s
test nightly --no-default-features	2m 0s
test nightly	1m 51s
test nightly --all-features	1m 55s
	17m 6s

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