feat: add `abigen!` macro #140

Job	Run time
Build starknet-ff features	3m 29s
Build starknet-curve features	1m 26s
Build starknet-crypto-codegen features	1m 26s
Build starknet-crypto features	1m 50s
Build starknet-core features	2m 9s
Build starknet-providers features	3m 20s
Build starknet-signers features	3m 24s
Build starknet-accounts features	2m 27s
Build starknet-contract features	2m 16s
Build starknet-macros features	2m 17s
Build starknet features	3m 19s
	27m 23s

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