Collect initializer time/amount of dependencies for container services

Now it is possible to also collect the time needed to instantiate every single service used in a request, to make it work you need to add this two lines to settings.php (or, event better, to settings.local.php):

$class_loader->addPsr4('Drupal\\webprofiler\\', [ __DIR__ . '/../../modules/contrib/webprofiler/src']);
$settings['container_base_class'] = '\Drupal\webprofiler\DependencyInjection\TraceableContainer';