Changes to Creates or updates the storefront (Artist Storefront) of a track.

the errors/items response's property type changed from string to object for status 403

the errors/items response's property type changed from string to object for status 404

added the optional property errors/items/error_message to the response with the 400 status

added the optional property errors/items/error_message to the response with the 401 status

added the optional property errors/items/error_message to the response with the 403 status

added the optional property errors/items/error_message to the response with the 404 status

endpoint added