### Bug description

It could be useful to add one alias for all slides output in our  the format detection utility function (https://quarto.org/docs/extensions/lua.html#format-detection) so that it is easy to target slides in a Lua filter only for slides.  

Example: Removing Pause syntax
````lua
Para = function(e)
  if (not quarto.doc.isFormat("revealjs") or not quarto.doc.isFormat("beamer") or not quarto.doc.isFormat("pptx")) then
    if (e == pandoc.Para '. . .') then
      return {}
    end
  end
  return nil
end
````
cderv
2022-09-05T15:40:38Z
cderv
enhancement
Future
open
Add an alias to target all slides format in `quarto.doc.isFormat()`
https://github.com/quarto-dev/quarto-cli/issues/2305