Tests

chore: make ExtBytecode pointer private #4575

Job	Run time
check no_std	19s
check	17s
check no_std kzg-rs	25s
check serde	21s
check std	20s
clippy	1m 14s
test stable --no-default-features	1m 47s
test stable	1m 42s
docs	1m 11s
test stable --all-features	1m 45s
fmt	12s
test beta --no-default-features	1m 43s
test beta	1m 49s
TyposCheck	6s
test beta --all-features	1m 51s
test nightly --no-default-features	1m 44s
test nightly	1m 40s
test nightly --all-features	1m 48s
	20m 14s

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