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/TweenLine2DEquationExtensions.cs

@@ -4,13 +4,28 @@ namespace Engine.Systems.Tween;
 
 public static class TweenLine2DEquationExtensions
 {
+    private static readonly BoxedPool<Line2DEquation> boxedLine2DEquationPool = new(2);
+
     public static ITween TweenLine2DEquation(this Line2DEquation initialLine2DEquation, ITweenManager tweenManager, float duration, Line2DEquation targetLine2DEquation, System.Action<Line2DEquation> setMethod)
-        => tweenManager.StartTween(duration,
+    {
+        Boxed<Line2DEquation> boxedInitial = boxedLine2DEquationPool.Get(initialLine2DEquation);
+        Boxed<Line2DEquation> boxedTarget = boxedLine2DEquationPool.Get(targetLine2DEquation);
+
+        ITween tween = tweenManager.StartTween(duration,
             t => setMethod?.Invoke(
                 new Line2DEquation(
-                    initialLine2DEquation.Slope.Lerp(targetLine2DEquation.Slope, t),
-                    initialLine2DEquation.OffsetY.Lerp(targetLine2DEquation.OffsetY, t)
+                    boxedInitial.Value.Slope.Lerp(boxedTarget.Value.Slope, t),
+                    boxedInitial.Value.OffsetY.Lerp(boxedTarget.Value.OffsetY, t)
                 )
             )
         );
+
+        tween.OnComplete(() =>
+        {
+            boxedLine2DEquationPool.Return(boxedInitial);
+            boxedLine2DEquationPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }