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

[Paul Norman]

@pnorman commented on this pull request.



> +
+This is part of a project to add generalization support to osm2pgsql. See
+https://osm2pgsql.org/generalization/ for more information.
+
+Generalization is currently only supported for Web Mercator (EPSG 3857). This
+is by far the most common use case, we can look at extending this later if
+needed.
+
+## Usage
+
+Run osm2pgsql as usual. This example assumes you have a table called
+`landcover` with a polygon geometry column called `geom` and a text column
+called `type` with the type of the landcover (forest, grass, etc.).
+
+Create a table `landcover_z10` with (at least) columns `geom` and `type` as
+well as integer columns `x`, and `y`. Then call this:

An index on `x, y` is also needed

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