feat: implement `Neg` for `AffinePoint` (#546) #325

Job	Run time
Build starknet-ff features	1m 2s
Build starknet-curve features	44s
Build starknet-crypto-codegen features	56s
Build starknet-crypto features	1m 0s
Build starknet-core features	1m 24s
Build starknet-providers features	1m 47s
Build starknet-signers features	1m 8s
Build starknet-accounts features	1m 29s
Build starknet-contract features	1m 25s
Build starknet-macros features	1m 3s
Build starknet features	2m 18s
	14m 16s

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