Audit sponsor_id, is_sponsee, coop_agreement and coop_agreement_id
CHANGELOG:
### ADDED
- [#875](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/875) Audit sponsor_id, is_sponsee, coop_agreement and coop_agreement_id
Related card: https://trello.com/c/VN4cOfY6/1375-afegir-notes-de-log-a-alguns-camps-de-models-odoo
Edited by Pelayo García