RustFFI bindings for Arkworks library

Relevant links:

1. https://github.com/yvan-sraka/cargo-cabal
2. https://github.com/yvan-sraka/hs-bindgen-types#
3. https://github.com/orgs/arkworks-rs/repositories

Setup

1. Install Rust and update to latest stable release

rustup update

Build Rust library and test

cd rust-ffi
cargo build
cargo test

Build Haskel and run test

cabal build rust-ffi
cabal run rust-ffi-test