Image node: Add "Open source image location" menu item / button

[Quinn-Elara]

Feature/enhancement description:
For longer term projects, it would be useful to have a context menu item or button on the Image node to open the location of the source image in the file explorer. This would allow for easier consolidation of scattered project files during a cleanup pass.

[williamchange]

The image button should already bring you to the source location for the image, and if you're using the built-in file explorer, there should be an option on right click to open that in your OS' file explorer