Blender Git Loki

Geometry Nodes: Merge by Distance (Direct Modifier Port)

This patch is a direct port of the Weld modifier that moves the
common code to the geometry module.
I had made another version of a Merge by Distance Modifier (D10888), with an own implementation,
but I found that the original modifiers algorithm gives finer results.

Differential Revision: https://developer.blender.org/D12019