Creation of new pack products
CHANGELOG:
### ADDED
- [#863](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/863) Creation of new pack products
Related card: https://trello.com/c/5NZC9zzw/1373-creaci%C3%B3-de-nous-productes-de-pack
Edited by César López Ramírez