perf: improved garbage created by tweens slightly

They still do generate a lot of garbage but with boxed value pools I made the boxes reusable, it still does generate garbage through the delegate creation, gotta find a solution for them later

Engine.Systems/Tween/EngineExtensions/TweenCircleExtensions.cs

@@ -4,13 +4,28 @@ namespace Engine.Systems.Tween;
 
 public static class TweenCircleExtensions
 {
+    private static readonly BoxedPool<Circle> boxedCirclePool = new(2);
+
     public static ITween TweenCircle(this Circle initialCircle, ITweenManager tweenManager, float duration, Circle targetCircle, System.Action<Circle> setMethod)
-        => tweenManager.StartTween(duration,
+    {
+        Boxed<Circle> boxedInitial = boxedCirclePool.Get(initialCircle);
+        Boxed<Circle> boxedTarget = boxedCirclePool.Get(targetCircle);
+
+        ITween tween = tweenManager.StartTween(duration,
             t => setMethod?.Invoke(
                 new Circle(
-                    initialCircle.Center.Lerp(targetCircle.Center, t),
-                    initialCircle.Diameter.Lerp(targetCircle.Diameter, t)
+                    boxedInitial.Value.Center.Lerp(boxedTarget.Value.Center, t),
+                    boxedInitial.Value.Diameter.Lerp(boxedTarget.Value.Diameter, t)
                 )
             )
         );
+
+        tween.OnComplete(() =>
+        {
+            boxedCirclePool.Return(boxedInitial);
+            boxedCirclePool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }