Draft: Feat: terminate contract new endpoint

CHANGELOG:

### Feat
- [#1111](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1111) 

Related card: https://trello.com/c/mvTKjBYp/1749-nou-endpoint-per-baixa-de-contracte

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