Feature request: to_glue

@ChrisBeaumont this is for you, maybe @astrofrog too since you made the successful one-off pvextractor widget.

Would it be possible to open a cube in Glue, or at least with the Glue quick-viewer, from within an existing session?  I'm thinking of getting access to on-the-fly coordinate changes within glue, essentially, but starting from a regular old command line application.
This is wrong, but it was based off of http://www.glueviz.org/en/stable/glue_from_python.html#usage-examples.  I guess `catalog` is not a DataCollection in that example but something else.