Support using feature filters with tiles from geojson-vt

[lucaswoj]

For whatever reason geojson-vt generates vector tiles with geojson properties mapped to the tags property. This module used to check for f.tags and it is still mentioned in the code comments but it was removed: mapbox/feature-filter#12 (comment) - looks like nobody could remember why it was there. It would be good to support filtering tiles generated by geojson-vt, either by changing geojson-vt to use properties (which would also require changes to vt-pbf) or changing this back to check f.tags too.

Migrated from mapbox/feature-filter#20

[mourner]

I think we should migrate to using properties everywhere for consistency. cc @gmaclennan

[mourner]

-> mapbox/geojson-vt#80