Implement packet handler sender

GameServer/KcpSharp/ArrayMemoryOwner.cs

@@ -0,0 +1,22 @@
+#if !NEED_POH_SHIM
+
+using System.Buffers;
+
+namespace EggLink.DanhengServer.KcpSharp
+{
+    internal sealed class ArrayMemoryOwner : IMemoryOwner<byte>
+    {
+        private readonly byte[] _buffer;
+
+        public ArrayMemoryOwner(byte[] buffer)
+        {
+            _buffer = buffer ?? throw new ArgumentNullException(nameof(buffer));
+        }
+
+        public Memory<byte> Memory => _buffer;
+
+        public void Dispose() { }
+    }
+}
+
+#endif