Implementing In-app updates

[kartikeysaran]

Adding In-app updates inside Ankidroid which is a Play Core library feature that prompts active users to update your app.

Additional context
https://developer.android.com/guide/playcore/in-app-updates

[welcome]

Hello! 👋 Thanks for logging this issue. Please remember we are all volunteers here, so some patience may be required before we can get to the issue. Also remember that the fastest way to get resolution on an issue is to propose a change directly, https://github.com/ankidroid/Anki-Android/wiki/Contributing

[mikehardy]

I am very aware mikehardy/react-native-update-apk#16

I still don't think it has value versus almost anything else, duplicates #8469