Tests

Optimize gas cost subtraction by using checked_sub for safer arithmetic #4943

Job	Run time
docs	1m 4s
clippy	1m 18s
check no_std	22s
check no_std kzg-rs	26s
check	21s
fmt	9s
check serde	27s
test stable --no-default-features	27s
TyposCheck	8s
check std	20s
test stable	38s
test stable --all-features	58s
test beta --no-default-features	1m 49s
test beta	1m 45s
test beta --all-features	1m 55s
test nightly --no-default-features	1m 43s
test nightly	1m 40s
test nightly --all-features	1m 43s
	17m 13s

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