Add setting for unstyled mode

In 🐛 Klaro library seems way too large? Active I saw that klaro-no-css.js actually IS used already, so the left question is - should there be a way to use a styled one or do we better solve all styling in Drupal? (I'd vote for the second option and would close this then, but maybe others think different?)

We are using the JS without CSS, but loading the CSS-file separately, see klaro.libraries.yml

Here I have linked the SCSS which we use to override klaro-styles:
https://www.drupal.org/project/klaro/issues/3495342#comment-15912052 ✨ Stylings per used theme Active

If you want to disable loading the klaro.min.css, you can use this code:

/**
 * Implements hook_library_info_alter().
 */
function mymodule_library_info_alter(&$libraries, $extension) {
  if ($extension === 'klaro') {
    unset($libraries['library']['css']);
  }
}

If more people need this function, we can add this as config item.