Tests

Chore: some no_std cleanup (#1834) #24

Job	Run time
docs	1m 5s
clippy	1m 23s
check	33s
check no_std	29s
check serde	27s
fmt	12s
check no_std kzg-rs	32s
check std	24s
test stable --no-default-features	2m 5s
test stable	2m 3s
TyposCheck	5s
test stable --all-features	2m 3s
test beta --no-default-features	2m 1s
test beta	2m 6s
test beta --all-features	2m 7s
test nightly --no-default-features	1m 55s
test nightly	1m 55s
test nightly --all-features	1m 57s
	23m 22s

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