docs: add docs for `starknet-curve` (#633) #603

Job	Run time
Build C++ integration example	1m 19s
Build starknet-curve features	15s
Build starknet-crypto features	31s
Build starknet-core features	1m 3s
Build starknet-providers features	1m 8s
Build starknet-signers features	56s
Build starknet-accounts features	53s
Build starknet-contract features	56s
Build starknet-macros features	32s
Build starknet features	1m 44s
	9m 17s

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