Builds a renderable array for a field value.
Drupal\Core\Entity\EntityInterface $entity: The entity being displayed.
string $langcode: The language associated with $items.
array $items: Array of values for this field.
array A renderable array for $items, as an array of child elements keyed by numeric indexes starting from 0.
public function viewElements(EntityInterface $entity, $langcode, array $items);