Feat: allow to print SIM letter for each mobile lead line within lead
CHANGELOG:
### Added
- [#914](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/914) Allow to print SIM letter for each mobile lead line within lead
Related card: https://trello.com/c/M6Yy6XIM/1463-imprimir-carta-sim-crm-lead-amb-n-m%C3%B2bils