Support DBI scanning through entity handler options instead of specific handlers

[eblondel]

With the support of handler options (see #346), there is no need to use specific designed handlers like the one developed in #347 for DBI scanning:

• Handlers dbi_csv, dbi_gsheet, dbi_excel will be deprecated (with addition of active/deprecated status and associates notes to characterize handlers).
• Handlers csv, gsheet, excel will be enriched with an option enrich_from_dbi that will support the same DBI scanning logic.

In addition the ocs handler will have the same enrich_from_dbi option. This will enable to use CSV/Excel entities stored in OCS with DB scanning.

[wheintz]

Hi @eblondel ,
I just tried this new functionality of handler enrichment, but it sends an error (with or without the option, using handler OCS):
Erreur dans handle_entities_csv(config = config, source = entities_file, : l'argument "handler" est manquant, avec aucune valeur par défaut
Thanks!

[eblondel]

This error let think geoflow has not been reinstalled correctly, as this shows old code
Try to restart R and reinstall geoflow.

[wheintz]

Thank you @eblondel ,
Indeed I had to restart my R session... Now everything is OK!
Cheers.