[Tile-serving] [openstreetmap/osm2pgsql] LUA: calculate length (m) and area (m^2) (Discussion #1756)

[Tobias]

Would it be possible to calculate …
- the length (way) and 
- the area (area/polygons) 

… of objects in LUA? If so, this would be a convenient addition to the new [LUA geometry helper](https://osm2pgsql.org/doc/manual.html#geometry-objects-in-lua).

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With this I could filter for example small ponds (that lack specific tags) or small segments of road that I am not interested in. (Those filter are a bit rough, since I only look at one object, of course, but good enough for some use cases.)

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