[IMP] point_of_sale,*pos*: configure pos from general settings

Purpose:

- Move PoS settings in general settings to be consistent with the rest
  of Odoo (PoS being the only app where settings are split in two locations)
- Clean settings by enabling obvious settings or dropping unnecessary ones.

closes odoo/odoo#84719

Task-id: 2753430
Related: odoo/upgrade#3260
Related: odoo/enterprise#24425
Signed-off-by: Masereel Pierre <pim@odoo.com>