feat: add debug to render helpers for easier console debugging

[thymikee]

Summary

Adds debug and debug.shallow to render helpers to render. It's way more convenient than importing debug from the library, and feeding the component/json output to it. Plus it aligns well with react-testing-library's debug. Also improved the custom message by adding it to the top for easier discovery. Added docs say it all:

const { debug } = render(<Component />);

debug('optional message');

logs optional message and colored JSX:

optional message

<TouchableOpacity
  activeOpacity={0.2}
  onPress={[Function bound fn]}
>
  <Text>Press me</Text>
</TouchableOpacity>

Test plan

Included, some adjusted.

[Esemesek]

:)