code: def _add_tabular_layer(self, tabular_layer, layer_name, save_style=False):
          
          return self._add_vector_layer(tabular_layer, layer_name, save_style)
docs: Add a tabular layer to the geopackage.
  
          :param tabular_layer: The layer to add.
          :type tabular_layer: QgsVectorLayer
  
          :param layer_name: The name of the layer in the datastore.
          :type layer_name: str
  
          :param save_style: If we have to save a QML too. Default to False.
          Not implemented in geopackage !
          :type save_style: bool
  
          :returns: A two-tuple. The first element will be True if we could add
              the layer to the datastore. The second element will be the layer
              name which has been used or the error message.
          :rtype: (bool, str)
  
          .. versionadded:: 4.0