Tests

Check performance of gas with i64 #1884 #4945

Job	Run time
check	36s
check no_std	20s
clippy	1m 13s
check serde	30s
check no_std kzg-rs	26s
check std	18s
docs	1m 6s
fmt	6s
TyposCheck	5s
test stable --no-default-features	41s
test stable	32s
test stable --all-features	56s
test beta --no-default-features	1m 50s
test beta	1m 42s
test beta --all-features	1m 52s
test nightly --no-default-features	1m 42s
test nightly	1m 43s
test nightly --all-features	1m 43s
	17m 21s

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