Implement per-app language setting for Android 13

[leondzn]

Overview

This addresses #929 and #879

Android 13 introduces per-app language setting where you can now change the app language on a centralized location in the system settings without relying on the currently active system language. And also without having to create a custom language picker inside the app.

Accessible via Settings > System > Languages & Input > App Languages

However only apps that explicitly support Per-App Language settings will appear on the menu.

This PR enables that.

There are two changes that have been done in order to do that:

1. Updating the compile SDK version to API level 33 (Android 13)
   This will enable us to use the android:localeConfig attribute on the AndroidManifest. I've also took the liberty of also updating the target SDK version to match. In doing so, however, there are a breaking change with the GestureDetector.OnGestureListener interface. In which the MotionEvent parameters on the interface methods are now non-nullable. There are only two implementing classes namely AndroidDataView.kt and ScrollableChart.kt in which I updated the implementing method parameters. UI tests that use these classes has also been updated.

2. Added a locales_config.xml resource file to specify the supported languages that should appear on the menu. As of now I based the language codes from the available strings.xml localized files.

Testing

I've manually tested this on a Pixel 6 emulator and a physical Pixel 4a both running Android 13.
There is a warning on the Android manifest file about android:localeConfig being only available for API 33 and not on lower sdk versions but the app still works fine. I tested on an emulated Pixel 4 running Android 11. My guess is since Per-App language setting doesn't exist in < API 33, the android:localeConfig attribute will never be queried anyway.

For automated tests, all existing unit tests passed.
Some of the UI tests are failing even before I made these changes. While tests involving AndroidDataView.kt and ScrollableChart.kt are still passing.

[iSoron]

Thanks for the PR, @leondzn. All the changes look good to me. Android 13 also introduces Notification runtime permissions. Do we need any changes to support that?

[oscfdezdz]

0e13997 enables monochrome icon introduced in #1497 for me, with the latest stable version it is not displayed.

[leondzn]

@iSoron Apologies for the late response. I haven't visited this PR in a while. But I will try and take a look and confirm if we need to have any changes for Notification runtime permissions when I have the time. I'll let you know as soon as I can.

[hiqua]

@leondzn did you have time to have a look?

[hiqua]

Superseded by #1783