Add public attribute in product
CHANGELOG:
### REFACTOR
- [#627](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/627) Add public attribute in product
https://trello.com/c/xBD3YYOw/968-canviar-com-decidim-quins-productes-es-publiquen-als-formularis
Related card:Edited by Pelayo García