Add vertical CRS selection widget to vector layer properties (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#58162
Author: @nyalldawson
QGIS version: 3.40

Add vertical CRS selection widget to vector layer properties

PR Description:

Follows the same behavior as the project setting, i.e.:

If the layer has a 3d crs set, then the widget is disabled with an explanatory note:

If the layer has a 2d crs set, then the user can select the appropriate vertical crs:

There's also a explanatory note detailing where vertical CRS are respected, along with a warning:

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