Start sync client manager implementation

src/broadcast_messages.rs

@@ -9,9 +9,9 @@ pub enum BroadcastMessage {
     /// Close all the sessions of a given user
     CloseAllUserSessions(UserID),
     /// Stop sync client for a given user
-    StopSyncClientForUser(UserID),
+    StopSyncTaskForUser(UserID),
     /// Start sync client for a given user (if not already running)
-    StartSyncClientForUser(UserID),
+    StartSyncTaskForUser(UserID),
     /// Stop a client with a given client ID
     StopSyncClient(SyncClientID),
-}
+}