Benching Paillier libraries

Benchmarks of libraries implementing Paillier encryption in various languages as part of a blog post on the concrete performance of our Rust library.

All code has been tested on macOS and Google GCE (Ubuntu), some also on Raspberry Pis and mobile phones.

Each subdirectory contains notes regarding specific installation and running. Setup instructions for a blank Google GCE instance and Running Rust+Ramp test on phones are also available.