feat: add `abigen!` macro #120

Job	Run time
Build starknet-ff features	1m 1s
Build starknet-curve features	28s
Build starknet-crypto-codegen features	46s
Build starknet-crypto features	44s
Build starknet-core features	1m 20s
Build starknet-providers features	1m 59s
Build starknet-signers features	1m 18s
Build starknet-accounts features	1m 41s
Build starknet-contract features	2m 4s
Build starknet-macros features	1m 59s
Build starknet features	2m 33s
	15m 53s

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