cubicweb #2410508 rebuild fti for a given set of entity types [validation pending]

It would be nice to be able to specify a set of entity types when rebuilding FTI. cubicweb.server.checkintegrity.reindex_entities() already accepts a list of entity types, it's therefore just a matter of exposing this feature to the end user through cubicweb-ctl db-rebuild-fti

done in3.15.2
load left0.000
closed by#cc83a3f16c0f [fti] make db-rebuild-fti accept etypes on command line (closes #2410508)