Appearance does not export `setColorScheme`

[nikkwong]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the issue

The Appearance module does not export setColorScheme like the react-native counterpart.

  import { Appearance } from 'react-native'
  useEffect(() => {
    Appearance.setColorScheme(''); // throws an exception
  }, [nativeColorScheme]);

Expected behavior

It should match the API of Appearance

Steps to reproduce

Please see above.

Test case

https://codesandbox.com/null

Additional comments

No response

[necolas]

I'll review a PR