Change Details

TBD

This diff moves the FFI functions from CXX from `main.rs` to the `cxx_bridge.rs` file. The reason for moving the FFI away from the `main.rs` to its own scope is that the `ffi::*` functions should be called from the gRPC server handlers (for example in D5487). Linear task: [[ https://linear.app/comm/issue/ENG-2094/adding-dependencies-and-grpc-tonic-core-in-tunnelbroker-rust | ENG-2094 ]]

TBDhis diff moves the FFI functions from CXX from `main.rs` to the `cxx_bridge.rs` file. The reason for moving the FFI away from the `main.rs` to its own scope is that the `ffi::*` functions should be called from the gRPC server handlers (for example in D5487). Linear task: [[ https://linear.app/comm/issue/ENG-2094/adding-dependencies-and-grpc-tonic-core-in-tunnelbroker-rust | ENG-2094 ]]