Android ViewBinding support

### Description of the problem / feature request:

Support [Android ViewBinding](https://developer.android.com/topic/libraries/view-binding) for Android apps.

### Feature requests: what underlying problem are you trying to solve with this feature?

ViewBinding allows generating at build-time a Java class with accessors for different views in a layout, without having to rely on `findViewById` etc. It's similar to the DataBinding talked about in bazelbuild/bazel#2694, but more recent, simple and less feature-heavy (it's only giving bindings to the view, no data updates or anything).

### Have you found anything relevant by searching the web?

bazelbuild/bazel#2694, which is about a similar Jetpack feature, but not the same, and https://github.com/bazelbuild/rules_kotlin/issues/401, which is asking about ViewBinding support in Bazel (arguably in the wrong repo though).