Add force_polygon_cw and force_polygon_ccw expression functions (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#45718
Author: @nyalldawson
QGIS version: 3.24

Add force_polygon_cw and force_polygon_ccw expression functions

PR Description:

These are recommended for use instead of the existing force_rhr function, due to the variability in definition of the "right hand rule" between different software applications. Using an explicit force_polygon_cw/ccw function removes user confusion when the results vary between different applications.

(Note that this matches PostGIS' recommendations now: see https://postgis.net/docs/ST_ForceRHR.html )

I'd like to backport this to 3.22 too.

Commits tagged with [need-docs] or [FEATURE]