Entity query allows to specify entity type ID for reference fields

Now, the entity query allows specifying entity type ID with the entity property just like context system.

Before

Drupal::entityQuery('node')
  ->condition('uid.entity.name', 'foobar', '=')
  ->execute();

After

Drupal::entityQuery('node')
  ->condition('uid.entity:user.name', 'foobar', '=')
  ->execute();

Note: Before code still works. This is just an extra feature for the multiple entity type reference fields i.e. dynamic_entity_reference.