This adds three new nodes:
* `Shortest Edge Paths`: Actually finds the shortest paths.
* `Edge Paths to Curves`: Converts the paths to separate curves.
This may generate a quadratic amount of data, making it slow
for large meshes.
* `Edge Paths to Selection`: Generates an edge selection that
contains all edges that are part of a path. This can be used
with the Separate Geometry node to only keep the edges that
are part of a path. For large meshes, this approach can be
much faster than the `Edge Paths to Curves` node, because
less data is created.
Differential Revision: https://developer.blender.org/D15274
c8ae1fce60