Blender Git Loki

Geometry Nodes: Implicit interpolations to and from the edge domain

This patch adds the remaining 6 interpolations for mesh domains.
The new interpolations are:
- Corner / point / polygon to edge
- Edge to corner / point / polygon

After this it is possible to adapt an attribute to and from every
mesh domain. This is simple to test with the "Attribute Convert" node.

Though, as a note for the future, there are still some improvements
possible to the interpolations, like lazily calculating values for the
interpolations where it's possible, and slightly improving the
algorithms used for some interpolations, like using corner angles
for polygon to point.

Differential Revision: https://developer.blender.org/D10765