[Tile-serving] [openstreetmap/osm2pgsql] WIP: Add code to generalize polygons using two different strategies (PR #1830)

[Jochen Topf]

This is part of the generalization effort (https://osm2pgsql.org/generalization/).

For some context see 
* https://blog.jochentopf.com/2022-11-15-processing-architecture-for-generalization-in-osm2pgsql.html
* https://blog.jochentopf.com/2022-11-21-generalizing-polygons.html

> Is the main goal here to verify that the algorithms produce useful results before implementing in osm2pgsql?

Yes. And to see how performant it is. It doesn't help us if it can't be used in real-world scenarios.


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