Draft: Add mm_fiber_contract_mmproxy_view

CHANGELOG:

### Added
- [#763](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/763) Add SQL view table `mm_fiber_contract_mmproxy_view`

Related card: https://trello.com/c/pZs7avU0/1083-definir-la-tarifa-10gbep-si-un-provisi%C3%B3-t%C3%A9-la-propiet%C3%A0ria-amb-fibra-mm

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