Builds a renderable array for one field on one entity instance.
Drupal\Core\Entity\EntityInterface $entity: The entity being displayed.
string $langcode: The language associated with $items.
array $items: Array of field values already loaded for the entities, keyed by entity id.
array A renderable array for a themed field with its label and all its values.
public function view(EntityInterface $entity, $langcode, array $items);