Request: add Android inspection that makes sure ViewModel subclasses aren't set as private classes

Because then it causes a crash of this form:

```
RuntimeException: Cannot create an instance of class ...
...
IllegalAccessException: java.lang.Class<...> is not accessible from java.lang.Class<androidx.lifecycle.ViewModelProvider$AndroidViewModelFactory>
```

Also requested on the issue tracker:
https://issuetracker.google.com/issues/244799783