Add Maestro screenshot generation

[TheLastProject]

This is a PoC of generation screenshots with Maestro.

TODO:

• [ ] Use "Catima" instead of "Catima Debug" app name (use the release APK perhaps?)
• [ ] Generate all 7 other screenshots (TODO: requires dark mode, figure out how)
• [ ] Somehow activate Android demo mode for prettier screenshots (this ensures the screenshots don't show a random timestamp in the title bar)
• [ ] Somehow use different locales
• [ ] Document this or write a script to generate all screenshots

One very big downside of Maestro is that it's slow. Extremely slow. It takes a full 6 minutes to generate this one screenshots. Scaling this to all Catima's supported languages may not be reasonable.

You can try the current code as follows:

1. Install Maestro (sadly they don't have properly Linux packages)
2. Manually start an Android Studio emulator (the autostart is broken on Linux: https://github.com/mobile-dev-inc/maestro/issues/1492)
3. Run maestro test maestro/01.yaml
4. Wait 6(!) minutes
5. Look at the new screenshot-01 image that's generated