[IMP] self_consumption: adding reports and documents

I leave you the links to the tasks related to these changes.:

• [A1] Generar Documentació > AUTORITZACIÓ GESTOR AUTOCONSUM[]
• Generar Documentació > FITXER TXT COEFICIENTS DE REPARTIMENT
• [A1] Generar Documentació > ACORD DE REPARTIMENT

Changelog

• [IMP] energy_selfconsumption: Added authorization report
• [IMP] energy_selfconsumption: Added power-sharing agreement report
• [IMP] energy_selfconsumption: Added custom paper format without header and footer.
• [IMP] energy_selfconsumption: new wizard and controller to generate the TXT coefficient document
• [IMP] energy_selfconsumption: three new buttons with the download of the new reports in self-consumption project, only seen in activation or active projects.

Roadmap

• Better UI for buttons (names are too long) maybe create a wizard with all the documents.
• Simplify the generation of the coefficient TXT document, so it doesn't need a controller, wizard and other methods to be generated.
• Unit testing