first pass at xpc impl

kordophone/src/tests/test_client.rs

@@ -149,7 +149,10 @@ impl APIInterface for TestClient {
         Ok(String::from("test"))
     }
 
-    async fn mark_conversation_as_read(&mut self, conversation_id: &ConversationID) -> Result<(), Self::Error> {
+    async fn mark_conversation_as_read(
+        &mut self,
+        conversation_id: &ConversationID,
+    ) -> Result<(), Self::Error> {
         Ok(())
     }
 }