Oasis Network Rosetta Gateway Implementation

Sharing the code to an implementation of the Rosetta Gateway for the Oasis Network

Thanks for sharing @annefauvre!

I think your integration of the rosetta-cli into your testing framework is a paradigm other implementations should try to emulate as soon as possible. Ensuring balance-changing operations are represented consistently across upgrades to a node and your Rosetta implementation can be 100% automated with existing tools. :clap: