chore: 增加 rcp 支持

Realtime/Internal/Controller/LCIMRcpController.cs

@@ -0,0 +1,29 @@
+using System.Threading.Tasks;
+using LeanCloud.Realtime.Protocol;
+
+namespace LeanCloud.Realtime.Internal.Controller {
+    internal class LCIMRcpController : LCIMController {
+        internal LCIMRcpController(LCIMClient client) : base(client) {
+
+        }
+
+        #region 消息处理
+
+        internal override async Task OnNotification(GenericCommand notification) {
+            RcpCommand rcp = notification.RcpMessage;
+            string convId = rcp.Cid;
+            string msgId = rcp.Id;
+            long timestamp = rcp.T;
+            bool isRead = rcp.Read;
+            string fromId = rcp.From;
+            LCIMConversation conversation = await Client.GetOrQueryConversation(convId);
+            if (isRead) {
+                Client.OnMessageRead?.Invoke(conversation, msgId);
+            } else {
+                Client.OnMessageDelivered?.Invoke(conversation, msgId);
+            }
+        }
+
+        #endregion
+    }
+}