Pedersen Hash

[MauroToscano]

Tasks:

• [x] Implement Starknet Crypto equivalent implementation. Test with some values of StarknetRS
• [ ] Add a differential fuzzer against StarknetRS
• [ ] Generalize over the elliptic curve, retain a predefined one with the Starknet curve
• [ ] Implement an associated "IsMerkleTreeBackend"

Resources:

Iden3