[Tile-serving] [openstreetmap/osm2pgsql] New "flex" backend (#1036)

[Jochen Topf]

So far this is all a rough design and we don't know yet what the code will look like. I would like to support several geometry columns, because this is basically a generalization of a "normal" geometry plus the `way_area` we currently have and I see other use cases where this could be useful (polygon and centroid for instance), but as mentioned it isn't clear how exactly this would look like in the code and it might turn out to be to complex to do. osm2pgsql still needs to be reasonably simple to use and understand, so there is a limit on how complex things should get.

I am pretty sure we are not going to give Lua access to the actual geometries and are not using any Lua libraries for this, because it would be quite a lot of overhead "shipping" geometries from C++ to Lua code and back etc. All this should be done in C++ code for performance, but this would, of course, put some limits on what can be done.

I'd be interested in hearing about use cases and ideas people might have, this might influence some design decisions.

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