[IMP] energy_selfconsumption: invoicing acquired power

Trello cards:

• [A3] Facturació quotes recurrents per potència adquirida (contractes)
• [A3]-[A4]-[A5] UX-UI CONFIGURACIÓ FACTURACIÓ RECURRENT
• Incloure camp "Distribuidora" a la Fitxa de Projecte

Changelog

• [IMP] energy_project: added kw uom data. (Manually activation of UOM must be checked in general settings)
• [IMP] energy_selfconsumption: added contract, contract_variable_quantity, contract_queue_job and l10n_es dependency.
• [IMP] energy_selfconsumption: wizard for defining the invoicing mode of the project.
• [IMP] energy_selfconsumption: wizard for generation of contracts.
• [IMP] energy_selfconsumption: added reseller field to self-consumption project.
• [IMP] energy_selfconsumption: added smart button to self-consumption view to show contracts on active state