Endpoint for Contract IBAN Change Wizard
CHANGELOG:
### ADDED
- [#634](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/634) Endpoint for Contract IBAN Change Wizard
Related card: https://trello.com/c/sKcDxnrq/984-endpoint-canvi-iban
Edited by Pelayo García