feat(core): 支持拦截器功能

src/SKIT.FlurlHttpClient.Wechat/WechatHttpCallInterceptorCollection.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SKIT.FlurlHttpClient.Wechat
+{
+    public sealed class WechatHttpCallInterceptorCollection : IEnumerable<WechatHttpCallInterceptor>
+    {
+        private readonly IList<WechatHttpCallInterceptor> _list;
+
+        public int Count
+        {
+            get { return _list.Count; }
+        }
+
+        public WechatHttpCallInterceptor this[int index]
+        {
+            get { return _list[index]; }
+        }
+
+        public WechatHttpCallInterceptorCollection()
+        {
+            _list = new List<WechatHttpCallInterceptor>();
+        }
+
+        public void Add(WechatHttpCallInterceptor interceptor)
+        {
+            _list.Add(interceptor);
+        }
+
+        public void Remove(WechatHttpCallInterceptor interceptor)
+        {
+            _list.Remove(interceptor);
+        }
+
+        public IEnumerator<WechatHttpCallInterceptor> GetEnumerator()
+        {
+            return _list.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return ((IEnumerable)_list).GetEnumerator();
+        }
+    }
+}