(tools, client, server) feat: Remove gRPC support, add TCP back and reorganized project

Client/Assets/Scripts/Test/UdpClientTest.cs

@@ -8,7 +8,7 @@ namespace Test
     {
         private async void Start()
         {
-            var sendBytes = Encoding.UTF8.GetBytes("Test 汉语 and English simultaneously!");
+            var sendBytes = Encoding.UTF8.GetBytes("This is a test string sent via UDP.");
 
             var receivedBytes = await UnityUdpClient.Instance.SendAndReceiveData(sendBytes);
             var receivedString = Encoding.UTF8.GetString(receivedBytes);