Summary:
After `react-native-flipper` 0.48.0 I cannot build releases on android (I think that passed on CI tests because the example was running an older version of this package, 0.47.0).
So I moved all the `android/src/main` content to `android/src/debug` because we will not use Flipper in another Build Variant
## Changelog
I moved all content from `react-native-flipper/android/src/main` to `react-native-flipper/android/src/debug`.
Probably solves https://github.com/facebook/flipper/issues/1303
Pull Request resolved: https://github.com/facebook/flipper/pull/1325
Test Plan: Maybe create a custom CI script to verify if Flipper deps are present on Release Builds, [something like this](https://github.com/facebook/flipper/issues/1274#issue-641197153)
Reviewed By: cekkaewnumchai
Differential Revision: D22333432
Pulled By: passy
fbshipit-source-id: 4abbab5ecbe08d44752b2138569ff60d25724087
