[FIX]point_of_sale: adapt _create_account_move_line for inheritance
[FIX]point_of_sale: adapt _create_account_move_line for inheritance

This commit intend to allow better inheritance in the
account_move_line_creation_process

The new _prepare_account_move_and_lines method only prepare
the move and the lines but does not write and post them.

This is done by the former _create_account_move_line method.

Needed to fix pos_sessions with unbalanced journal entries
caused by round globally option with taxes included in price

I.E. opw-2038814

closes odoo/odoo#35351

Signed-off-by: Lucas Perais (lpe) <42d29efea96f3992aa24782120ec2948e42548fa@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo