Option to move app to external storage

### What problem does this address?

I've a low end device, and it usually has few capacity of storage. Option to move app to external storage can help a lot.

### What is your proposed solution?

Ability to move app to external storage.

### Did you search for existing feature suggestions?

- [X] I have searched for existing feature suggestions.

No files, tests, or entry points are named. Start by reviewing the Android app's storage configuration and how the project handles installation or app data, then determine the supported external-storage behavior and migration constraints. Done means users can move the app to external storage on supported low-end devices without losing app data.

Written by the indexing model from the issue text.