Create diagnostics_relay bindings

ffi/src/lib.rs

@@ -12,6 +12,8 @@ pub mod core_device;
 pub mod core_device_proxy;
 #[cfg(feature = "debug_proxy")]
 pub mod debug_proxy;
+#[cfg(feature = "diagnostics_relay")]
+pub mod diagnostics_relay;
 #[cfg(feature = "dvt")]
 pub mod dvt;
 mod errors;