Constructs a DisplayVariant plugin attribute object.
string $id: The plugin ID.
\Drupal\Core\StringTranslation\TranslatableMarkup $admin_label: The administrative label.
class-string|null $deriver: (optional) The deriver class.
Overrides Plugin::__construct
public function __construct(string $id, TranslatableMarkup $admin_label, ?string $deriver = NULL) { }