One variant for Chucker instead of two (library & library-no-op)

## :warning: Is your feature request related to a problem? Please describe
It is a request to make chucker has only one variant and can be defined in one line. Two lines/variants for Chucker is really a headache if your project is modularized. Also if you use chucker with a library you will have to make the library has the same variants as chucker to avoid class/resource duplications.

## :raising_hand: Do you want to develop this feature yourself?

- [x] Yes
- [ ] No

No files or tests are named in the issue. Start by locating the Android/Gradle variant configuration and mapping the library and library-no-op artifacts; done means a modularized project can declare one Chucker variant without matching project variants or duplicate classes and resources.

Written by the indexing model from the issue text.