feat: implement `Neg` for `AffinePoint` #324

Job	Run time
Build starknet-ff features	1m 6s
Build starknet-curve features	43s
Build starknet-crypto-codegen features	1m 0s
Build starknet-crypto features	1m 5s
Build starknet-core features	1m 20s
Build starknet-providers features	1m 51s
Build starknet-signers features	1m 12s
Build starknet-accounts features	1m 20s
Build starknet-contract features	1m 22s
Build starknet-macros features	1m 10s
Build starknet features	1m 58s
	14m 7s

Provide feedback