[expressions][feature] Add "equals" geometry function (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#64627
Author: @agiudiceandrea
QGIS version: 4.0

[expressions][feature] Add "equals" geometry function

PR Description:

Description

Adds the equals(geometry1, geometry2) geometry function which directly relies on QgsGeometry::equals to test the equality of two geometries.

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