feat: Add ActiviteDeProduction class

Frank Bessou requested to merge topic/default/ActiviteDeProduction into branch/default

It associates a Collectivite with a Production and a Fonction.

For example:

:production/LeMaladeImaginaire :aPourActiviteDeProduction :activiteDeProduction/prod1 :activiteDeProduction/prod1 :aPourProducteur :collectivite:Moliere :activiteDeProduction/prod1 :aPourFonction :fonction/PRODUCTEUR

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