feat: add `abigen!` macro #116

Job	Run time
Build starknet-ff features	1m 51s
Build starknet-curve features	1m 23s
Build starknet-crypto-codegen features	1m 22s
Build starknet-crypto features	1m 50s
Build starknet-core features	2m 7s
Build starknet-providers features	2m 34s
Build starknet-signers features	1m 48s
Build starknet-accounts features	2m 14s
Build starknet-contract features	2m 19s
Build starknet-macros features	2m 7s
Build starknet features	3m 20s
	22m 55s

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