feat: add `abigen!` macro #121

Job	Run time
Build starknet-ff features	51s
Build starknet-curve features	23s
Build starknet-crypto-codegen features	36s
Build starknet-crypto features	39s
Build starknet-core features	1m 44s
Build starknet-providers features	3m 30s
Build starknet-signers features	1m 19s
Build starknet-accounts features	1m 37s
Build starknet-contract features	1m 31s
Build starknet-macros features	1m 47s
Build starknet features	2m 42s
	16m 39s

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