Make it possible to select a certain page in the new PDF viewer

[Growebis]

Before the new PDF viewer, i could just tap on the indicator of the page and scroll to a certain page especially for pdfs with a lot of pages. But with the new PDF viewer, Unless I'm missing something, i can no longer do that and have to instead scroll for a very long time which becomes very tedious, not to mention the bug with the viewer skipping or shuffling pages but there is already an issue created for it. so in short, add the functionality to jump to a certain page in a pdf.