Add "Hide price if not orderable" option

Ok seems we need it -.-

Not as simple as it seems first...

It seems, that we need to hook into the view, instead of using "hook_entity_field_access" as we do not have access to the entity through the field definition or any other parameter provided.

@grevil yes I know. Please wait with the implementation here, we first have to discuss if and how we can solve this best.
For that reason, it's assigned to me.

Update: For now we won't need it, as I now solved it differently (apart from this module) by hiding the price, if it's empty:

/**
 * Implements hook_entity_field_access().
 */
function drowl_customer_entity_field_access($operation, \Drupal\Core\Field\FieldDefinitionInterface $field_definition, \Drupal\Core\Session\AccountInterface $account, ?\Drupal\Core\Field\FieldItemListInterface $items = NULL) {
  // Hide the price fields displays:
  if ($operation === 'view') {
    if (in_array($field_definition->getName(), ['price', 'list_price', 'unit_price', 'total_price'])) {
      $priceValue = $items->getValue();
      // Hide price if empty:
      if(isset($priceValue['number']) && empty($priceValue)){
        return \Drupal\Core\Access\AccessResult::forbidden();
      }
    }
  }
  return \Drupal\Core\Access\AccessResult::neutral();
}

Still this option may make sense for this module in the future.