starknet-core: enable `starknet-types-core`'s std feature in std #574

Job	Run time
Build C++ integration example	1m 27s
Build starknet-curve features	1m 5s
Build starknet-crypto-codegen features	51s
Build starknet-crypto features	1m 10s
Build starknet-core features	1m 51s
Build starknet-providers features	1m 45s
Build starknet-signers features	1m 29s
Build starknet-accounts features	1m 27s
Build starknet-contract features	1m 27s
Build starknet-macros features	1m 5s
Build starknet features	2m 23s
	16m 0s

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