cubicweb-drh #4345834 add signedrequest and rqlconstroller cubes [validation pending]

This will help use cases with "cwclientlib".

prioritynormal
typeenhancement
done in0.19.0
load0.100
load left0.000
closed by#a24cd795bb8b add signedrequest, rqlcontroller and jsonld cubes (closes #4345834)
patchadd signedrequest, rqlcontroller and jsonld cubes (closes #4345834) [applied]