code: def add_table(self, id_, name, rows, cols, x, y, cx, cy):
          
          graphicFrame = CT_GraphicalObjectFrame.new_table_graphicFrame(
              id_, name, rows, cols, x, y, cx, cy
          )
          self.insert_element_before(graphicFrame, 'p:extLst')
          return graphicFrame
docs: Append a ``<p:graphicFrame>`` shape containing a table as specified
          in call.