Expanded class hierarchy of WrapperPluginInterface in Backup and Migrate 5.0.x

interface \Drupal\Component\Plugin\ConfigurableInterface; interface \Drupal\Component\Plugin\DependentPluginInterface
- interface \Drupal\backup_migrate\Drupal\EntityPlugins\WrapperPluginInterface
  - interface \Drupal\backup_migrate\Drupal\EntityPlugins\DestinationPluginInterface
  - interface \Drupal\backup_migrate\Drupal\EntityPlugins\SourcePluginInterface

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