Surface EXIF information for picked media with MediaPicker

Media on the platforms can have metadata attached that might be useful for developers to have. That way they can read information such as: the location, the rotation, resolution and other things that come in useful for further processing of the media.

We would need to create abstract objects to represent this and then map the platform data to these models when we return the results for a media file.

Start with the MediaPicker entry point and review how picked media results are returned across platforms. Define the abstract metadata objects and map platform EXIF data such as location, rotation, and resolution into them. Done means developers can access this metadata from picked media results on the supported platforms.

Written by the indexing model from the issue text.