[Feature request] Allow shorthand for jumping to a page by label

[Vortriz]

I am using the last alpha release and I see that there is gg for goto_beginning and 150gg will go to 150th page. But there is no such shorthand command for jumping to page with labels. We can use goto_page_with_label but that open up a prompt just like goto_page_with_page_number, which makes this a two step process.

It would be nice a have a separate command which goes to page by labels. My suggestion would be implement something like toggle_goto_behaviour which allows user to change behaviour of <num>gg to either jump by page number or page label. It would be very useful since most modern books have page labels.

Also, cherry on top to show page labels in TOC and bottom bar itself. Maybe a universal toggle like toggle_file_navigation that replaces page number with page labels everywhere. Cheers!

EDIT: I just realised that shorthand navigation with labels would be a problem because something like iiigg would be hard to detect. Nonetheless, I hope the visual change of showing page label instead of number in TOC and bottom bar would still be possible.