feat(wxapi): 封装公众平台、开放平台接口

src/SKIT.FlurlHttpClient.Wechat.Api/Events/MpPush/LocationPushEvent.cs

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+using System;
+using System.Collections.Generic;
+
+namespace SKIT.FlurlHttpClient.Wechat.Api.Events
+{
+    /// <summary>
+    /// <para>表示 EVENT.LOCATION 事件的数据。</para>
+    /// <para>REF: https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Receiving_event_pushes.html#%E4%B8%8A%E6%8A%A5%E5%9C%B0%E7%90%86%E4%BD%8D%E7%BD%AE%E4%BA%8B%E4%BB%B6 </para>
+    /// </summary>
+    public class LocationPushEvent : WechatApiEvent, WechatApiEvent.Types.IXmlSerializable
+    {
+        /// <summary>
+        /// 获取或设置地理位置纬度。
+        /// </summary>
+        [System.Xml.Serialization.XmlElement("Latitude")]
+        public double Latitude { get; set; }
+
+        /// <summary>
+        /// 获取或设置地理位置经度。
+        /// </summary>
+        [System.Xml.Serialization.XmlElement("Longitude")]
+        public double Longitude { get; set; }
+
+        /// <summary>
+        /// 获取或设置地理位置精度。
+        /// </summary>
+        [System.Xml.Serialization.XmlElement("Precision")]
+        public double Precision { get; set; }
+    }
+}