Make the tag layout a separate repo so it can be updated and improved

[binyaminyblatt]

I would like to propose that we separate the scraper scripts from the tag layout and call the current layout version 1 of audiobook tagging specification that way people can comment and possibly improving the layout to do this we would need to add a version number future specification updates otherwise it would default to version one in that way people could request and implement different providers using this specification for instance if I wanted to adjust the specification to include whether a book is adult or not I would for instance change the version code to version 1.1 and add those fields allowing me to maintain compatibility with older specifications
Also it means that we can give the specification to third party apps and when they go to read the ID3 tags and they'll understand them for instance audiobookshelf has an issue that it just assumes anything in the artist tag is an artist even though the narrators are in there too