Support for ST_CoverageClean based on the recent release of geos 3.14 and postgis 3.6

[GuntuAshok]

The recent release of Geos 3.14 highlighted the feature Coverage cleaning for polygonal coverages which solves use cases that involve cleaning up invalid geometry edges.

Postgis 3.6 release introduced ST_CoverageClean based on that. Here's is a summary of what it does from postgis docs.

https://postgis.net/docs/manual-dev/it/ST_CoverageClean.html

A window function which alters the edges of a polygonal coverage to ensure that none of the polygons overlap, that small gaps are snapped away, and that all shared edges are exactly identical. The result is a clean coverage that will pass validation tests like ST_CoverageInvalidEdges.

https://libgeos.org/posts/2025-08-21-geos-3-14-released/

Pls look into it @Maxxen this feature is really helpful.

[tbbuck]

Hiya - I just added a PR for this if that's any help?

#683

Totally agree on the use case, it's a magnificent feature that the GEOS team have come up with!