refactor: extracted interface from pool and added events

Engine.Core/Helpers/IPool.cs

@@ -0,0 +1,10 @@
+namespace Syntriax.Engine.Core;
+
+public interface IPool<T>
+{
+    Event<IPool<T>, T> OnRemoved { get; }
+    Event<IPool<T>, T> OnReturned { get; }
+
+    T Get();
+    void Return(T item);
+}