Adds a new operator to automatically rotate UV Islands into alignment.
Modes:
* Auto (All edges)
* Geometry (V direction will point in geometry direction) [1]
* Edge (Rotate until selected edge is in V direction)
Also adds uv_sync_selection support to UV Randomize Transform.
Resolves: T78399
Differential Revision: https://developer.blender.org/D15820
[1] Listed as "World" in Task description.
