Provide info on 1d extraction for Specviz2d

[Jdaviz-Triage-Bot]

Reporter: Brian Cherinka

Feedback during demo of Jdaviz-MAST to JWST folks.  When a single s2d is displayed in Specviz2d, the helper performs a quick basic extraction of a 1d spectrum to be displayed in the profile view.  It would be useful to expose, or have accessible, information on how the extraction was made, number of pixels, etc.    

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