[facet] create a RangeRQLPathFacet (closes #2852512)
This facet is a mix between a RQLPathFacet and a RangeFacet, allowing
to use the FacetRangeWidget on the RQLPathFacet target attribute
usr/lib/PY_VERSION/*-packages/cubicweb/entities/
usr/lib/PY_VERSION/*-packages/cubicweb/ext/
usr/share/cubicweb/cubes/
usr/lib/PY_VERSION/*-packages/cubicweb/*.py