Tests

Chore: some no_std cleanup (#1834) #13

Job	Run time
clippy	11s
check	14s
check no_std	13s
check serde	12s
check no_std kzg-rs	14s
docs	19s
check std	12s
fmt	12s
test stable --no-default-features	11s
TyposCheck	6s
test stable	13s
test stable --all-features	6s
test beta --no-default-features	12s
test beta	10s
test beta --all-features	14s
test nightly --no-default-features	15s
test nightly	5s
test nightly --all-features	12s
	3m 31s

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