增加 初始化 服务方法

lib/src/rammus_iml.dart

@@ -70,7 +70,10 @@ Stream<OnNotificationReceivedInApp> get onNotificationReceivedInApp =>
 Future<String?> get deviceId async {
   return _channel.invokeMethod("deviceId");
 }
-
+/// 初始化服务
+void initPushService() {
+  if (Platform.isAndroid) _channel.invokeMethod("initPushService");
+}
 Future<CommonCallbackResult> get pushChannelStatus async {
   var result = await _channel.invokeMethod("checkPushChannelStatus");