APK size significantly increased due to Pdfium usage

[melvin4u445]

Remove pdfium library from the build because it has increased the apk size from 5 MB to 48 MB and according to @CloudLevi there are also other reasons to replace this library.

Related commit ba41cb5

[kirillt]

1. We have split universal APK into individual APKs by target:
   https://github.com/ARK-Builders/ARK-Navigator/actions/runs/2449022646
   Size reduced to 23MB.

2. We have implemented PDF previews rendering using Pdfium but in the Rust lib, build size reduced further to 18.5MB:
   https://github.com/ARK-Builders/ARK-Navigator/actions/runs/2645847993

ARK-Builders/arklib-android#8
This PR isn't merged yet due to necessity of performance tuning (PDF previews generation slowed down significantly), but this should be matter of time and this issue isn't actual now anyway.