1，添加是否允许机器人发生自定义群通知的开关；2，重构部分代码

broker/src/main/java/io/moquette/imhandler/SendMessageHandler.java

@@ -98,8 +98,9 @@ public class SendMessageHandler extends IMHandler<WFCMessage.Message> {
     }
 
     @Override
-    public ErrorCode action(ByteBuf ackPayload, String clientID, String fromUser, boolean isAdmin, WFCMessage.Message message, Qos1PublishHandler.IMCallback callback) {
+    public ErrorCode action(ByteBuf ackPayload, String clientID, String fromUser, ProtoConstants.RequestSourceType requestSourceType, WFCMessage.Message message, Qos1PublishHandler.IMCallback callback) {
         ErrorCode errorCode = ErrorCode.ERROR_CODE_SUCCESS;
+        boolean isAdmin = requestSourceType == ProtoConstants.RequestSourceType.Request_From_Admin;
         if (message != null) {
             boolean ignoreMsg = false;
             if (!isAdmin) {  //admin do not check the right