Feat/terminate reasons endpoint
CHANGELOG:
### ADDED
- [#1150](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1150) Created terminate reasons endpoint
Related card: https://trello.com/c/HvbHJQYL/1759-endpoint-motius-de-finalitzaci%C3%B3