Blender Git Loki

Geometry Nodes: Add "Location" output to Attribute Proximity node

This patch adds an output field to the Attribute Proximity node and
renames the existing string socket from "Result" to "Distance".
- The "Distance" output contains distance to the closest position
on the Target geometry.
- The new "Location" output contains the coordinates of the closest
position on the Target geometry.

A basic use case for this data is a simple shrinkwrap operation.

Differential Revision: https://developer.blender.org/D10415