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

[Paul Norman]

I've been experimenting with the results now, and am having an error where the lower-left corner of each tile's polygon is being clipped away

I created the base table with
```sql
CREATE MATERIALIZED VIEW
osm_planet_trees
AS
SELECT
    osm_id,
    way,
    name,
    ref,
    way_area
FROM planet_osm_polygon
WHERE "natural" = 'wood' OR landuse = 'forest'
```
then ran
``PGDATABASE=flex time ~/osm/osm2pgsql/build/osm2pgsql-gen -t planet_osm_trees -T
trees_z10 -g way -G name -s raster-union -x0 -X1024 -y0 -Y1024 -z10 -m 0.125``

The result in qgis looks like this:

![image](https://user-images.githubusercontent.com/1190866/208136129-425d2f61-0180-4209-afe8-d2ac885397fd.png)


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