Implemenation of Anemoi (algebraic hash function) gadget

[dtebbs]

Depends on #96

[vesselinux]

Anemoi: Exploiting the Link between Arithmetization-Orientation and CCZ-Equivalence, https://eprint.iacr.org/2022/840

Anemoi: a Family of ZK-friendly AO Hash Functions, https://github.com/vesselinux/anemoi-hash

[vesselinux]

Just pushed an update to the Anemoi r1cs gadgets implementation, addressing the latest comments from PR #65.