[android] Generate split and universal APKs

[NyaomiDEV]

Is your feature request related to a problem? Please describe.
I'm looking for a way to have both an universal APK and per-ABI splitted APKs in Tauri specifically, but I'm creating this issue here as it seems that the cause lies here.

Describe the solution you'd like
split_per_abi should be a tri-state switch instead of a boolean value, so that we can have this intermediate feature where we have both.

Describe alternatives you've considered
Running the build command twice, even with everything already cached, wastes too much time.

Additional context
Not applicable