[IMP] pos_restaurant: build_line_resume & computeChanges resume datasets now are inheritables

With this commits the data sets about resume of the orderline now are
inheritable, we are introducing new functions that will be the ones that
returns the data structure of the lines resume; That info could be
easily extended.

closes odoo/odoo#134031

Signed-off-by: Pedram Bi Ria (pebr) <pebr@odoo.com>