[Tile-serving] [openstreetmap/osm2pgsql] Re-do Lua API (#901)

[Sarah Hoffmann]

It's possible, we have the information but it would make the processing more expensive. Currently we only retrieve geometries for ways that have not been filtered. If filtering needs the geometries then we need to retrieve it for all ways. So my favourite solution would be a callback function for Lua that can retrieve the geometry when needed. (e.g. in the particular case only for ways that are rendered in a country-specific style.).

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