Move PDF support on Android to the new Jetpack library

[HadrienGardeur]

Google is finally working on a native Jetpack library for PDF support at https://developer.android.com/jetpack/androidx/releases/pdf

While it's currently missing byte arrays/streams support, @mickael-menu opened an issue that got accepted by Google: https://issuetracker.google.com/issues/358918885?pli=1#comment3

This means that's we're finally going to be able to provide a solution for large PDF files that are encrypted by LCP. Right now, support for these documents requires a PSPDFKit license.

[stevenzeck]

Another feature that is needed is parsing a PDF's document metadata. I don't see that available yet in their APIs.