feat: restructure part3 fix examples #4314

Job	Run time
test stable --no-default-features	55s
test stable	1m 4s
test stable --all-features	1m 23s
test beta --no-default-features	59s
test beta	1m 1s
check no_std	20s
check	18s
test beta --all-features	1m 17s
check no_std kzg-rs	27s
clippy	1m 15s
check serde	21s
test nightly --no-default-features	48s
test nightly	51s
check std	23s
docs	59s
test nightly --all-features	1m 16s
fmt	7s
TyposCheck	6s
	13m 50s

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