feat: add `abigen!` macro #117

Job	Run time
Build starknet-ff features	48s
Build starknet-curve features	27s
Build starknet-crypto-codegen features	34s
Build starknet-crypto features	55s
Build starknet-core features	1m 34s
Build starknet-providers features	1m 57s
Build starknet-signers features	1m 4s
Build starknet-accounts features	1m 28s
Build starknet-contract features	1m 23s
Build starknet-macros features	1m 29s
Build starknet features	2m 35s
	14m 14s

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