Adds the ability to sync just one conversation

kordophoned/src/main.rs

@@ -65,6 +65,15 @@ async fn main() {
                             0
                         });
                 }
+
+                Signal::MessagesUpdated(conversation_id) => {
+                    log::info!("Sending signal: MessagesUpdated for conversation {}", conversation_id);
+                    endpoint.send_signal(interface::OBJECT_PATH, DbusSignals::MessagesUpdated{ conversation_id })
+                        .unwrap_or_else(|_| {
+                            log::error!("Failed to send signal");
+                            0
+                        });
+                }
             }
         }
     });