[IMP] energy_project: services and providers model

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Changelog

• [IMP] energy_project: service model for external energy services control via API
• [IMP] energy_project: model provider of the external energy services.
• [IMP] energy_project: added new category on settings to configure the services, providers and the services available.
• [IMP] energy_seflconsumption: data for first services and providers.
• [IMP] energy_seflconsumption: new tab on selfconsumption projects to select contracted services.
• [IMP] energy_project: unit testing
• [I18N] energy_project: updated and translated (used files from !289 (merged)