feat:引入wfc即时通讯IM plugin

src/wfc/messages/channelMenuEventMessageContent.js

@@ -0,0 +1,17 @@
+import MessageContent from "./messageContent";
+import MessageContentType from "./messageContentType";
+
+export default class ChannelMenuEventMessageContent extends MessageContent {
+    menu
+
+    constructor(menu) {
+        super(MessageContentType.Channel_Menu_Event);
+        this.menu = menu;
+    }
+
+    encode() {
+        let payload = super.encode();
+        payload.content = JSON.stringify(this.menu);
+        return payload;
+    }
+}