added method to interface: get_hookable_instance_by_class_name

src/Plugin/HookableCollection.php

@@ -11,5 +11,14 @@ interface HookableCollection extends Hookable {
 	 */
 	public function add_hookable( Hookable $hookable_object );
 
+	/**
+	 * Get hookable instance.
+	 *
+	 * @param string $class_name Class name.
+	 *
+	 * @return false|Hookable
+	 */
+	public function get_hookable_instance_by_class_name( $class_name );
+
 }