Extend the query builder to include around nodes within area

like this
```
area[name="Bonn"];
node(area)[highway=bus_stop]->.bus_stops;
( 
  way(around.bus_stops:100)[amenity=cinema];
  node(around.bus_stops:100)[amenity=cinema];
);
(._;>;);
out meta;
```
From:

https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL#Relative_to_other_elements_.28around.29