Option to open session/console in a floating window

[juliasilge]

Discussed in https://github.com/posit-dev/positron/discussions/4284

^{Originally posted by wurli August 8, 2024} This would be really nice for cases when the traditional split screen doesn't offer enough real-estate, e.g. for viewing large tibbles etc. Personally I like to have my terminal open on another monitor entirely - VSCode/Positron already support this as shown, but unfortunately not yet with the console!

Loving Positron so far, thanks for all the work to create such an awesome free product!

[jmcphers]

FYI, has also been one of the most-upvoted and commented feature requests for RStudio for years. https://github.com/rstudio/rstudio/issues/2833

[petetronic]

@jthomasmock for your review