[FIX] energy_selfconsumption: add compute method

Important: This bug occurred when we tried to deploy in production. It is not clear why this method was removed, perhaps it was due to a poorly performed rebase.

added ToBeReviewed label

requested review from @DaniilDigtyar

approved this merge request

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• 4ca9cf53 - when first_date or last_date not defined days_invoced is 0

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merged

mentioned in commit 30ad5c87

mentioned in merge request !334 (merged)