Add inactive sponsored flag to ResPartner
CHANGELOG:
### Added
- [#806](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/806) Add inactive sponsored flag to ResPartner
Related card: https://trello.com/c/dCu62Oas/1269-flag-apadrinada-donada-de-baixa-a-la-fitxe-de-contacte
Edited by Daniel Palomar