[IMP] ipoint_of_sale,l10n_in_pos: customer and HSN code on receipt

To be compliant with the indian law, some informations should be
displayed on the receipt in the POS.

So we've added the customer name and phone nulber if any. We've also
added the HSN code of products for each line.

closes odoo/odoo#36590

Task-id: 2000231
Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>