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/TweenCamera2DExtensions.cs

@@ -4,9 +4,21 @@ namespace Engine.Systems.Tween;
 
 public static class TweenCamera2DExtensions
 {
+    private static readonly BoxedPool<float> boxedFloatPool = new(2);
+
     public static ITween TweenZoom(this ICamera2D camera2D, ITweenManager tweenManager, float duration, float targetZoom)
     {
-        float initialZoom = camera2D.Zoom;
-        return tweenManager.StartTween(duration, t => camera2D.Zoom = initialZoom.Lerp(targetZoom, t));
+        Boxed<float> boxedInitial = boxedFloatPool.Get(camera2D.Zoom);
+        Boxed<float> boxedTarget = boxedFloatPool.Get(targetZoom);
+
+        ITween tween = tweenManager.StartTween(duration, t => camera2D.Zoom = boxedInitial.Value.Lerp(boxedTarget.Value, t));
+
+        tween.OnComplete(() =>
+        {
+            boxedFloatPool.Return(boxedInitial);
+            boxedFloatPool.Return(boxedTarget);
+        });
+
+        return tween;
     }
 }