Contacts with active contracts

CHANGELOG:

### Added
- [#690](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/690) Add field has active contract to partner

Related card: https://trello.com/c/Wa8qkhF2/1052-identificaci%C3%B3-de-contactes-amb-contractes-actius-camp-calculat

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