Added BoolTransition (#16941)

src/Avalonia.Base/Animation/Transitions/BoolTransition.cs

@@ -0,0 +1,14 @@
+using System;
+using Avalonia.Animation.Animators;
+
+namespace Avalonia.Animation
+{
+    /// <summary>
+    /// Transition class that handles <see cref="AvaloniaProperty"/> with <see cref="bool"/> types.
+    /// </summary>  
+    public class BoolTransition : Transition<bool>
+    {
+        internal override IObservable<bool> DoTransition(IObservable<double> progress, bool oldValue, bool newValue) => 
+            AnimatorDrivenTransition<bool, BoolAnimator>.Transition(Easing, progress, oldValue, newValue);
+    }
+}