Feature: Translate ValueObjects via TranslationConnectorInterface

[mficzel]

This adds the TranslationConnectorInterface that allows to extract and reapply translatable fields from valueObjects.

/**
 * @template T of object
 */
interface TranslationConnectorInterface
{
    /**
     * @param T $object
     * @return array<non-empty-string, string>
     */
    public function extractTranslations(object $object): array;

    /**
     * @param T $object
     * @param array<non-empty-string, string> $translations
     * @return T
     */
    public function applyTranslations(object $object, array $translations): object;
}

The feature is configured via setting:

Sitegeist:
  LostInTranslation:  
    nodeTranslation:
   
      #
      # Translate all object properties that have a translationConnector configured
      # if this is set to false each property must be enabled via options.automaticTranslation
      #
      translateTypesWithConnectors: true

      #
      # Connectors to translate value object properties
      #
      # for each value object type a clas implementing the TranslationConnectorInterface
      # can be configured to extract and apply translations
      #
      translationConnectors:  
        Vendor\Site\Class => Vendor\Site\ClassConnector