add Poseidon implementation over bn254 #495
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Description
This PR adds support for Poseidon hash over the scalar field of BN254, Poseidon has better performance compared to MiMC and is being used in multiple projects.
Fixes #494
Type of change
How has this been tested?
All unit tests have been made according to the code referenced in Poseidon paper page 20 footnote 16.
How has this been benchmarked?
The code hasn't been benchmarked yet.
Checklist: