component storage doesnt need ID storage

src/ComponentStorage.cs

@@ -11,7 +11,6 @@ internal abstract class ComponentStorage
 internal class ComponentStorage<TComponent> : ComponentStorage where TComponent : struct
 {
 	private int nextID;
-	private IDStorage idStorage = new IDStorage();
 	private readonly Dictionary<int, int> entityIDToStorageIndex = new Dictionary<int, int>(16);
 	private int[] entityIDs = new int[16];
 	private TComponent[] components = new TComponent[16];