Implement Jubjub/Poseidon backends wrappers in Schnorr signature scheme #2817
Description
Why
We want to provide an easy way to replace the backend implementations of Jubjub signature and Poseidon hash in the Schnorr signature of the STM library
What
Create a wrapper for the Jubjub and Poseidon backends in the Schnorr signature scheme of the STM library.
How
- Create a wrapper for the Jubjub signature backend
- Create a wrapper for the Poseidon hash backend
- Implement golden tests