fix: make macro crate-agnostic #4345

Job	Run time
check no_std	23s
check	18s
check no_std kzg-rs	26s
check serde	19s
check std	21s
clippy	1m 26s
docs	58s
fmt	11s
test stable --no-default-features	46s
TyposCheck	5s
test stable	52s
test stable --all-features	1m 13s
test beta --no-default-features	53s
test beta	47s
test beta --all-features	1m 8s
test nightly --no-default-features	46s
test nightly	45s
test nightly --all-features	1m 10s
	12m 47s

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