[multi-sources-removal] Drop pyrorql and zmqrql sources After a few years experementing "true" multi-sources, we're now moving to "copy-based" source à la datafeed. As pyro and zmq sources have no more known customers and the related code is in the way of future refactoring of cubicweb's core, we decided to drop support for those sources without backward compatibility. If you're still using a zmqrql or pyrorql source and you want to upgrade, ask support to move it to datafeed using a pre-3.19 version first. Related to #2919300 (first step)

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TACHES

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-- écrire objet stocke/manipule les données

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-- extraire tests de chaîne de caractère

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* utiliser sqlite 

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* écrire fonction prend chemin en argument et renvoie contenu

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* extraire tests (chaîne de caractère) de spec 

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* utiliser yams pour schéma