[Tile-serving] [openstreetmap/osm2pgsql] WORK IN PROGRESS: Add pole_of_inaccessibility() function in Lua for polygons (PR #1822)

[Jakob Miksch]

The computation worked well for my test area (Heidelberg city). 

I like the approach with the ellipse a lot. In many cases it gives better results for labeling than the circle. Like in these examples:

![Screenshot from 2022-11-18 19-01-51](https://user-images.githubusercontent.com/15704517/202773679-40fdde93-2d3d-4f51-9cf6-1aa4c2fb06ca.png)

![Screenshot from 2022-11-18 19-02-21](https://user-images.githubusercontent.com/15704517/202773711-8225142e-3fa0-42b5-9589-1e5cea3b0e51.png)

![Screenshot from 2022-11-18 19-05-03](https://user-images.githubusercontent.com/15704517/202773720-7ff8ec64-6645-455b-98e6-ca3cb9cd29f0.png)

However, in the following example I was surprised about the location of `poi2`. I would have expected it somewhere in the right-top of  `poi1` (blue)

![Screenshot from 2022-11-18 19-03-44](https://user-images.githubusercontent.com/15704517/202773910-cf47bdad-c514-45de-9415-9db85edb57bb.png)




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