Fix is_valid(polygon,polygon_with_holes,multipolygon) (#9209)

## Summary of Changes

The current is_valid was based on locating within a constrained
triangulation (which is not sufficient), and failing to handle some
location on edges/vertices. It was also missing sanity tests such as
outer hull/hole orientation tests, edge-touching holes/polygons, etc.

This PR rewrites all the stack (polygon, polygon with holes,
multipolygon) using CDT+2.

Relates #8137 because the polygon was
still detected as invalid after repairing the input.

## Release Management

* Affected package(s): `Polygon_repair`
* Issue(s) solved (if any): -
* Feature/Small Feature (if any): -
* License and copyright ownership: no change

Author: sloriot