Allow to close sessions after an inactivity time to be defined

CHANGELOG:

### Added
- [#666](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/666) Allow to close sessions after a custom time of inactivity

Related card: https://trello.com/c/toXDUTL5/1040-moure-lentrada-dodoo-a-attendance-i-fer-caducar-la-sessi%C3%B3-cada-2-hores

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We can change the param (Seconds) here from the UI: