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/TweenQuaternionExtensions.cs

@@ -1,10 +1,24 @@
-using System;
 using Engine.Core;
 
 namespace Engine.Systems.Tween;
 
 public static class TweenQuaternionExtensions
 {
-    public static ITween TweenQuaternion(this Quaternion initialQuaternion, ITweenManager tweenManager, float duration, Quaternion targetQuaternion, Action<Quaternion> setMethod)
-       => tweenManager.StartTween(duration, t => setMethod?.Invoke(initialQuaternion.SLerp(targetQuaternion, t)));
+    private static readonly BoxedPool<Quaternion> boxedQuaternionPool = new(2);
+
+    public static ITween TweenQuaternion(this Quaternion initialQuaternion, ITweenManager tweenManager, float duration, Quaternion targetQuaternion, System.Action<Quaternion> setMethod)
+    {
+        Boxed<Quaternion> boxedInitial = boxedQuaternionPool.Get(initialQuaternion);
+        Boxed<Quaternion> boxedTarget = boxedQuaternionPool.Get(targetQuaternion);
+
+        ITween tween = tweenManager.StartTween(duration, t => setMethod?.Invoke(boxedInitial.Value.SLerp(boxedTarget.Value, t)));
+
+        tween.OnComplete(() =>
+        {
+            boxedQuaternionPool.Return(boxedInitial);
+            boxedQuaternionPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }