feat(wxapi): 新增部分微信回调通知事件

src/SKIT.FlurlHttpClient.Wechat.Api/Events/MpReply/ImageMessageReply.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+
+namespace SKIT.FlurlHttpClient.Wechat.Api.Events
+{
+    /// <summary>
+    /// <para>表示被动回复图片消息的数据。</para>
+    /// <para>REF: https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Passive_user_reply_message.html#1 </para>
+    /// </summary>
+    public class ImageMessageReply : WechatApiEvent, WechatApiEvent.Types.IXmlSerializable
+    {
+        public new static class Types
+        {
+            public class Image
+            {
+                /// <summary>
+                /// 获取或设置图片 MediaId。
+                /// </summary>
+                [System.Xml.Serialization.XmlElement("MediaId")]
+                public string MediaId { get; set; } = string.Empty;
+            }
+        }
+
+        /// <summary>
+        /// 获取或设置图片信息。
+        /// </summary>
+        [System.Xml.Serialization.XmlElement("Image")]
+        public Types.Image Image { get; set; } = new Types.Image();
+
+        public ImageMessageReply()
+        {
+            Event = null;
+            MessageType = "image";
+        }
+    }
+}