Add a wrapper for a print pdf function using pagedown chrome print

[cderv]

Follows #51 discussions.

This could be useful waiting for such feature in Quarto.

Here, the function would just be a wrapper around pagedown::chrome_print().

Not so hard to add support for .qmd in chrome_print though, or just do

quarto::quarto_render("myslides.qmd")
pagedown::chrome_print("myslides.html")

[mcanouil]

Is the new dependency really worth it, for this two liner code?