Add computed `statistics` field to nodes, to expose Statistics' collected data

Statistics is approved for removal. See 🌱 [Policy] Deprecate Statistics module in D10 and move to contrib in D11 Fixed

This is now Postponed. The status is set according to two policies. The Remove a core extension and move it to a contributed project → and the Extensions approved for removal → policies.

It will be moved to a contributed Statistics project once the project is created and the Drupal 11 branch is open.

On it here now. We might need to move the implementation / patch over into contrib then, once the project exists.

https://www.webomelette.com/creating-pseudo-fields-drupal-8

Okay just looked into the code and saw, that statistics is already part of the "links" pseudo field:

/**
 * Implements hook_node_links_alter().
 */
function statistics_node_links_alter(array &$links, NodeInterface $entity, array &$context) {
  if ($context['view_mode'] != 'rss') {
    $links['#cache']['contexts'][] = 'user.permissions';
    if (\Drupal::currentUser()->hasPermission('view post access counter')) {
      $statistics = \Drupal::service('statistics.storage.node')->fetchView($entity->id());
      if ($statistics) {
        $statistics_links['statistics_counter']['title'] = \Drupal::translation()->formatPlural($statistics->getTotalCount(), '1 view', '@count views');
        $links['statistics'] = [
          '#theme' => 'links__node__statistics',
          '#links' => $statistics_links,
          '#attributes' => ['class' => ['links', 'inline']],
        ];
      }
      $links['#cache']['max-age'] = \Drupal::config('statistics.settings')->get('display_max_age');
    }
  }
}

So we should eventually turn this into a discussion about separating this out of the links field and into a separate field?

#16++

@fgm: would you accept a patch? 🤓

Sure, especially from you :-)