fix(Animations): Fix issue with multiple animators holding the same h…

…andle to their JS counterparts

src/Uno.UI/UI/Xaml/Media/Animation/Animators/RenderingLoopAnimator.wasm.cs

@@ -29,14 +29,13 @@ protected RenderingLoopAnimator(T from, T to)
 		private class Metadata : IJSObjectMetadata
 		{
 			public static Metadata Instance {get;} = new Metadata();
-			private Metadata() { }
 
-			private static long _handles = 0L;
+			private Metadata() { }
 
 			/// <inheritdoc />
 			public long CreateNativeInstance(IntPtr managedHandle)
 			{
-				var id = Interlocked.Increment(ref _handles);
+				var id = RenderingLoopAnimatorMetadataIdProvider.Next();
 				WebAssemblyRuntime.InvokeJS($"Windows.UI.Xaml.Media.Animation.RenderingLoopFloatAnimator.createInstance(\"{managedHandle}\", \"{id}\")");
 
 				return id;

src/Uno.UI/UI/Xaml/Media/Animation/Animators/RenderingLoopAnimatorMetadataIdProvider.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading;
+
+namespace Windows.UI.Xaml.Media.Animation
+{
+	internal static class RenderingLoopAnimatorMetadataIdProvider
+	{
+		private static long _next = 0L;
+
+		public static long Next() => Interlocked.Increment(ref _next);
+	}
+}