feat: accept numbers for `NUM_AS_HEX` (#491) #190

Job	Run time
Build starknet-ff features	47s
Build starknet-curve features	9s
Build starknet-crypto-codegen features	23s
Build starknet-crypto features	26s
Build starknet-core features	1m 26s
Build starknet-providers features	1m 40s
Build starknet-signers features	42s
Build starknet-accounts features	1m 28s
Build starknet-contract features	1m 40s
Build starknet-macros features	42s
Build starknet features	2m 24s
	11m 47s

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