radios theme doesn't use #wrapper_attributes

Problem/Motivation

The radios element uses a #theme_wrappers to add the wrapper around the radio button. However it doesn't support the #wrapper_attributes, so there is no way to add attributes to the wrapper element.

Also there is another issue where the class form-radios is not being added to the wrapper div. the core themes stable and stable9 do not add this class.

Steps to reproduce

Using this element below will mean the class form-radios--templates will not be added.

$form['radios'] = [
      '#type' => 'radios',
      '#options' => $options,
      '#wrapper_attributes' => [
        'class' => ['form-radios--templates'],
      ],
    ];

At the moment in template_preprocess_radios() is setting the #attributes to resetting the #attributes to [] and then setting just #id and #title, and not way to add any more to this.

The proposed resolution is to something like

function template_preprocess_radios(&$variables) {
  $element = $variables['element'];
  $variables['attributes'] = $element['#wrapper_attributes'] ?? [];
  if (isset($element['#id']) && !isset($variables['attributes']['id'])) {
    $variables['attributes']['id'] = $element['#id'];
  }
  if (isset($element['#attributes']['title']) && !isset($variables['attributes']['title'])) {
    $variables['attributes']['title'] = $element['#attributes']['title'];
  }
  $variables['children'] = $element['#children'];
}

So this will use wrapper_attributes if set and the only set id and title if they are not set.