Remove non desirable features and proprietary dependencies

Thanks to a Izzyondroid report, we can spot proprietary dependencies that should be removed:

• Firebase (/com/google/firebase)
• Firebase Data Transport (/com/google/android/datatransport)
• Google Mobile Services (/com/google/android/gms)
• ML Kit (/com/google/mlkit)
• Sentry SDK for Java (/io/sentry)

There are some advice suggested here: https://forum.duniter.org/t/apps-on-izzyondroid-floss-requirements/13740