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

Client/Assets/Scripts/Test/TcpClientTest.cs

@@ -0,0 +1,19 @@
+using Network;
+using System.Text;
+using UnityEngine;
+
+namespace Test
+{
+    public class TcpClientTest : MonoBehaviour
+    {
+        private async void Start()
+        {
+            var sendBytes = Encoding.UTF8.GetBytes("This is a test string sent via TCP.");
+
+            var receivedBytes = await UnityTcpClient.Instance.SendAndReceiveData(sendBytes);
+            var receivedString = Encoding.UTF8.GetString(receivedBytes);
+
+            Debug.Log($"Received string: {receivedString}");
+        }
+    }
+}