Move platfiorm conditionals to using statements

Author: Arlodotexe

components/Animations/src/Enums/FrameworkLayer.cs

@@ -2,6 +2,14 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+#if WINUI2
+using Composition = Windows.UI.Composition;
+using Animation = Windows.UI.Xaml.Media.Animation;
+#elif WINUI3
+using Composition = Microsoft.UI.Composition;
+using Animation = Microsoft.UI.Xaml.Media.Animation;
+#endif
+
 namespace CommunityToolkit.WinUI.Animations;
 
 /// <summary>
@@ -10,20 +18,12 @@ namespace CommunityToolkit.WinUI.Animations;
 public enum FrameworkLayer
 {
     /// <summary>
-#if WINUI2
-    /// Indicates the <see cref="Windows.UI.Composition"/> APIs.
-#elif WINUI3
-    /// Indicates the <see cref="Microsoft.UI.Composition"/> APIs.
-#endif
+    /// Indicates the <see cref="Composition"/> APIs.
     /// </summary>
     Composition,
 
     /// <summary>
-#if WINUI2
-    /// Indicates the <see cref="Windows.UI.Xaml.Media.Animation"/> APIs.
-#elif WINUI3
-    /// Indicates the <see cref="Microsoft.UI.Xaml.Media.Animation"/> APIs.
-#endif
+    /// Indicates the <see cref="Animation"/> APIs.
     /// </summary>
     Xaml
 }