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

[Jochen Topf]

@nextstopsun Yes, in theory that should be possible. You'd have to store the `admin_level` information from the relations in memory and then, in stage 2, write all ways that either have those tags themselves or are members of relations that have those tags to the database. You will have to hold a lot of data in memory though, so I don't know how feasible this is. Also you have to handle *all ways* in stage 2 if you can't restrict this to ways with some specific tags. This will likely be too slow.

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