Expose GEOS coverage simplification

[dbaston]

Feature description

Add a gdal vector geom simplify-coverage (or gdal vector simplify-coverage ?) that simplifies shared boundaries of a set of polygons, as described in https://lin-ear-th-inking.blogspot.com/2023/03/simplifying-polygonal-coverages-with-jts.html

Additional context

Unfortunately this algorithm requires reading all of the input features into memory before doing any processing, so the scaffolding of GDALVectorGeomAbstractAlgorithm cannot be readily used. Specifically, there isn't an obvious way to implement a TranslateFeature method.

[jratike80]

Could it somehow fit as a new option into ogr_layer_algebra https://gdal.org/en/stable/programs/ogr_layer_algebra.html?

[rouault]

Could it somehow fit as a new option into ogr_layer_algebra https://gdal.org/en/stable/programs/ogr_layer_algebra.html?

I'd rather see it as Dan proposed (probably under 'geom') rather than a new mode ogr_layer_algebra, given the later combines 2 layers

[rouault]

implemented per #12370