(client, server) feat:Add UDP client and server

Client/Assets/Scripts/Network/UnityUdpClient.cs

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+using System.Net.Sockets;
+using System.Threading.Tasks;
+using UnityEngine;
+using Utils;
+
+namespace Network
+{
+    public class UnityUdpClient : Singleton<UnityUdpClient>
+    {
+        private readonly UdpClient _client;
+
+        public UnityUdpClient()
+        {
+            _client = new UdpClient();
+            _client.Connect("127.0.0.1", 12345);
+
+            Application.quitting += () => _client.Close();
+        }
+
+        public async Task<byte[]> SendAndReceiveData(byte[] data)
+        {
+            await _client.SendAsync(data, data.Length);
+
+            var result = await _client.ReceiveAsync();
+            return result.Buffer;
+        }
+    }
+}

Client/Assets/Scripts/Network/UnityUdpClient.cs.meta

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+fileFormatVersion: 2
+guid: 1dde9b247fc7ffc478f6b77a79c1e11c

Client/Assets/Scripts/Test/UdpClientTest.cs

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+using Network;
+using System.Text;
+using UnityEngine;
+
+namespace Test
+{
+    public class UdpClientTest : MonoBehaviour
+    {
+        private async void Start()
+        {
+            var sendBytes = Encoding.UTF8.GetBytes("Test 汉语 and English simultaneously!");
+
+            var receivedBytes = await UnityUdpClient.Instance.SendAndReceiveData(sendBytes);
+            var receivedString = Encoding.UTF8.GetString(receivedBytes);
+
+            Debug.Log($"Received string: {receivedString}");
+        }
+    }
+}

Client/Assets/Scripts/Test/UdpClientTest.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: d76ad8f9d40092848abc97f05b1e2131