Expanded class hierarchy of PageVariantInterface in Drupal 9

interface \Drupal\Component\Plugin\PluginInspectionInterface; interface \Drupal\Component\Plugin\ConfigurableInterface; interface \Drupal\Component\Plugin\DependentPluginInterface; interface \Drupal\Core\Plugin\PluginFormInterface; interface \Drupal\Core\Cache\RefinableCacheableDependencyInterface
- interface \Drupal\Core\Display\VariantInterface
  - interface \Drupal\Core\Display\ContextAwareVariantInterface
  - interface \Drupal\Core\Display\PageVariantInterface

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