Blender Git Loki

Geometry Nodes: Add a method to find the lowest complexity attribute

For the attribute comparison node, it makes sense to read both input
attributes implicitly converted to the same data type. But the choice
of which of the two data types to read with is somewhat arbitrary.
This commit adds a utility function to choose the least "complex" data
type as a lowest common denominator, to make that choice less arbitrary
, and to support other needs in the future.