A client for Sonar written in Rust.

WIP

Notes:

• Currently needs branch core-refactor of Sonar
• Uses the HTTP API to communicate with Sonar
• hrpc is not used at the moment, but the serde-json messages for the HTTP API are derived from the Protobuf definitions in sonar-hrpc (we intend to add a HRPC API to Sonar, then the same message definitions can be used for both HRPC and HTTP).