Feat: Bank utils

CHANGELOG:

### Added
- [#1143](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1143) Example text

Related card: https://trello.com/c/2KnG4Ih7/1761-revisar-validaci%C3%B3-creaci%C3%B3-manual-iban

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