[ADD] website, base: improve name_get in case of multi_Website mode

In some case like for website_menu or res.partner from the sale_order form view
it is nice to know easily on which website this record is depending.

Co-authored-by: Derie Romain <rde@odoo.com>
Co-authored-by: Kersten Jérémy <jke@odoo.com>