[Tile-serving] [openstreetmap/osm2pgsql] Use libosmium for geometry building (#684)

[Paul Norman]

On the planet the PR is 
- 0.028% (71k/255M) fewer rows in planet_osm_polygon;
- 0.25% (6.94e+12/2.81749e+15) less ST_Area(way) in planet_osm_polygon;
- 0.28% (8.02e+12/2.83212457458888e+15) less way_area in planet_osm_polygon;
- 0.8% (1M/131M) fewer rows in planet_osm_line;
- 0.016% (2k/11M) more rows in planet_osm_roads; and
- unchanged for planet_osm_point



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