This diff introduces adding the [[ https://github.com/hyperium/tonic | Tonic ]] to cargo dependencies for the Rust library in Tunnelbroker.
The purpose of adding Tonic is to use it for gRPC communication.
Related Linear task: [[ https://linear.app/comm/issue/ENG-1072/use-rust-tonic-crate-in-tunnelbroker-to-implement-messagesstream | ENG-1072 ]]