Add Bandersnatch curve #159
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A proposition to add bandersnatch curve (in twisted Edwards form) to gnark. This PR implements Bandersnatch as a separate package from
twistededwardsmainly because each companion curve is identified by the base curve ID (e.g. BLS12-381 for both Bandersnatch and Jubjub). This has the advantage to keep backward compatibility but duplicates the exact same code. The other option is to create in gnark-crypto an ID for companion curves but gnark users should update their code.