[IMP] web: add a badge based widget for selection fields

This commit introduces a new widget to be used for selection-based fields.
Valid choices are displayed using rectangular badges and not like the
standard list. This widget is valid for selection and many2one fields
like selection or radio widgets.

Co-authored-by: Siddarth Gajjar <sga@odoo.com>
Co-authored-by: Mohammed Shekha <msh@openerp.com>