perf!: events refactored throughout all the project to use Event<> class

All delegate events are refactored to use the Event<TSender> and Event<TSender, TArgument> for performance issues regarding delegate events creating garbage, also this gives us better control on event invocation since C# Delegates did also create unnecessary garbage during Delegate.DynamicInvoke

Engine.Systems/Tween/TweenManager.cs

@@ -15,7 +15,7 @@ public class TweenManager : UniverseObject, ITweenManager
     public ITween StartTween(float duration, ITweenManager.TweenSetCallback? setCallback = null)
     {
         Tween tween = Get(duration);
-        tween.OnUpdated += tween => setCallback?.Invoke(tween.Value);
+        tween.OnUpdated.AddListener(tween => setCallback?.Invoke(tween.Value));
         runningCoroutines.Add(tween, coroutineManager.StartCoroutine(RunTween(tween)));
         return tween;
     }
@@ -59,6 +59,7 @@ public class TweenManager : UniverseObject, ITweenManager
         }
 
         runningCoroutines.Remove(tween);
+        Return(tween);
     }
 
     public void CancelTween(ITween tween)