Allow listeners added via config to be compiled in container by makin…

…g them factories

src/Event/functions.php

@@ -6,13 +6,8 @@
 
 if (!function_exists('PhpSchool\PhpWorkshop\Event\containerListener')) {
 
-    /**
-     * @param string $service
-     * @param string $method
-     * @return ContainerListenerHelper
-     */
-    function containerListener(string $service, string $method = '__invoke')
+    function containerListener(string $service, string $method = '__invoke'): callable
     {
-        return new ContainerListenerHelper($service, $method);
+        return fn () => new ContainerListenerHelper($service, $method);
     }
 }