Tests

Optimize gas cost subtraction using signed integer check #1884 #4942

Job	Run time
check	19s
check serde	21s
check std	18s
check no_std	21s
clippy	1m 19s
docs	1m 8s
check no_std kzg-rs	25s
fmt	8s
test stable --no-default-features	35s
TyposCheck	5s
test stable	28s
test stable --all-features	57s
test beta --no-default-features	1m 49s
test beta	1m 47s
test beta --all-features	1m 54s
test nightly --no-default-features	1m 48s
test nightly	1m 39s
test nightly --all-features	1m 46s
	17m 7s

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