feat: improve android native structure

[gladiuscode]

This PR aims to improve the current android native code structure to align it to the latest Turbo Modules guide.

So I've implemented the following changes:

• OrientationDirectoryImpl has been renamed to OrientationDirectorModuleImpl;
• Both newArch and oldArch Specs have been updated to classes that init the actual implementation and clearly
  separate the required boilerplate: either @ReactMethod or override;