code: function getEntityInformations(entityName, complementaryInformation) {
      checkIsString('entityName', entityName);
      checkIsObject('complementaryInformation', complementaryInformation);
      const key = entityName.split(SEPARATOR);
      if (!computedEntityContainer.hasIn(key)) {
          _buildEntityInformation(entityName);
      }
      return computedEntityContainer.get(entityName).mergeDeep(complementaryInformation).toJS();
  }
docs: Get the entity information from the entity name and given the extended informations.
  @param {string} entityName - The name of the entity.
  @param {object} complementaryInformation - Additional information on the entity.
  @return {object} - The entity informations from the entity  name.