feat: add `abigen!` macro #221

Job	Run time
Build starknet-ff features	50s
Build starknet-curve features	54s
Build starknet-crypto-codegen features	37s
Build starknet-crypto features	37s
Build starknet-core features	1m 2s
Build starknet-providers features	3m 6s
Build starknet-signers features	1m 22s
Build starknet-accounts features	1m 45s
Build starknet-contract features	2m 1s
Build starknet-macros features	1m 53s
Build starknet features	1m 51s
	15m 58s

Provide feedback