Geometry Nodes: Attribute Statistic Node

This nodes evaluates a field on a geometry and outputs various
statistics about the entire data set, like min, max, or even
the standard deviation. It works for float and vector types currently,
though more types could be supported in the future.

- All statistics are calculated element-wise for vectors.
- "Product" was not added since the result could very easily overflow.
- The "Size" output was not added since it isn't specific to an
attribute and would fit better in another node.

The implementation shares work as much as possible when multiple
statistics are needed.

This node has been in development since the beginning of this year,
with additions from Johnny Matthews and Hans Goudey.

Differential Revision: https://developer.blender.org/D10202

Geometry Nodes: Add Attribute Map Range Node

This commit adds a node with a "Map Range" operation for attributes
just like the non-attribute version of the node. However, unlike the
regular version of the node, it also supports operations on vectors.

Differential Revision: https://developer.blender.org/D10344

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

Fix T85493: Attribute glitches while using Attribute Proximity node

The span fill was in multithreaded code, so calculated values were
sometimes reset. The fix is to move FLT_MAX fill outside of parallel_for.

Differential Revision: https://developer.blender.org/D10378

Geometry Nodes: Add Attribute Proximity Node

This node calculates a distance from each point to the closest position
on a target geometry, similar to the vertex weight proximity modifier.
Mapping the output distance to a different range can be done with an
attribute math node after this node.

A drop-down changes whether to calculate distances from points,
edges, or faces. In points mode, the node also calculates distances
from point cloud points.

Design task and use cases: T84842

Differential Revision: https://developer.blender.org/D10154