[Tile-serving] [openstreetmap/osm2pgsql] Add `length()` Lua function for geometries (Issue #1757)

[Jochen Topf]

@victoriasiver26 Sure. Try installing osm2pgsql from source and running it using the flex output. Try the `geometries-using-insert.lua` example from the `flex-config` directory. Look there for use of the `area()` function. Then find the places in the source where the `area()` function is implemented and do the equivalent for the `length()` function.

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