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/JoinChatroomHandler.java

@@ -8,6 +8,7 @@
 
 package io.moquette.imhandler;
 
+import cn.wildfirechat.proto.ProtoConstants;
 import cn.wildfirechat.proto.WFCMessage;
 import io.moquette.spi.impl.Qos1PublishHandler;
 import io.netty.buffer.ByteBuf;
@@ -18,7 +19,7 @@ import win.liyufan.im.IMTopic;
 @Handler(IMTopic.JoinChatroomTopic)
 public class JoinChatroomHandler extends IMHandler<WFCMessage.IDBuf> {
     @Override
-    public ErrorCode action(ByteBuf ackPayload, String clientID, String fromUser, boolean isAdmin, WFCMessage.IDBuf request, Qos1PublishHandler.IMCallback callback) {
+    public ErrorCode action(ByteBuf ackPayload, String clientID, String fromUser, ProtoConstants.RequestSourceType requestSourceType, WFCMessage.IDBuf request, Qos1PublishHandler.IMCallback callback) {
         return m_messagesStore.handleJoinChatroom(fromUser, clientID, request.getId());
     }
 }