Expose PDFDocumentLoadingTask callbacks to props

[KingSora]

Good day!

As the library currently doesn't support password protected pdf files, we wanted to implement this functionality on our own. Currently its just not possible to interface with the PDFDocumentLoadingTask class which is used in the background. It would be really great if the RPProvider would provide two additional properties onPassword and onProgress which would solve this issue.

I know that password protected pdfs are in consideration on the roadmap, so this should be implemented in a way where future functionality (e.g. handling password protected pdfs directly by react-pdf) is taken into consideration.

Unrelated: the RPDefaultLayout should also expose a callback onMobileWidth: (mobileWidth: boolean) => void to make it easier to know whether the layout is currently in the mobile mode or not.