Support GitHub Codespaces

[vorburger]

Is your feature request related to a problem? Please describe.
In order to be able to test e.g. #2463 for #2237, as well as to be able to work on #2232, it would be much easier, at least for me, if I didn't need to have a computer with the Android Studio with the Android SDK etc. set up. (I originally used to have it set up, but changed computers since.)

Describe the solution you'd like
A great solution for this are GitHub's Codespaces, based on Dev Containers.

Describe alternatives you've considered
There are none.

Would you like to work on the issue?
Yes, I'll explore how hard it would be to make at least a very basic initial version available.