Tests

Optimize gas cost subtraction by using checked_sub for safer arithmetic #4944

Job	Run time
check	19s
clippy	1m 17s
check no_std	28s
check serde	22s
docs	1m 7s
check no_std kzg-rs	36s
check std	20s
test stable --no-default-features	25s
fmt	6s
TyposCheck	5s
test stable	32s
test stable --all-features	52s
test beta --no-default-features	40s
test beta	40s
test beta --all-features	1m 5s
test nightly --no-default-features	30s
test nightly	33s
test nightly --all-features	1m 1s
	10m 58s

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