Python wrapper for arkworks

[Pratyush]

Inspired by https://github.com/crate-crypto/py-arkworks-bls12381, I think it would be a good idea to make an opinionated Python wrapper for arkworks. To start with it could focus on a single curve/field/etc, and offer operations like MSMs, FFTs, IFFTs, polynomial arithmetic, etc.
The goal would be to allow simple and efficient protocol prototyping with arkworks.

Subsequently we could even enable writing circuits in Python and have them translated to Rust, either via the ConstraintSystem API or via some other custom wrapper.