Revert "Revert the Metal Experiment (#701)"

This reverts commit fe1617ffea.

src/Ryujinx/UI/Renderer/EmbeddedWindowMetal.cs

@@ -0,0 +1,19 @@
+using Ryujinx.Common.Helper;
+using SharpMetal.QuartzCore;
+using System;
+
+namespace Ryujinx.Ava.UI.Renderer
+{
+    public class EmbeddedWindowMetal : EmbeddedWindow
+    {
+        public CAMetalLayer CreateSurface()
+        {
+            if (OperatingSystem.IsMacOS() && RunningPlatform.IsArm)
+            {
+                return new CAMetalLayer(MetalLayer);
+            }
+            
+            throw new NotSupportedException($"Cannot create a {nameof(CAMetalLayer)} without being on ARM Mac.");
+        }
+    }
+}