Changes to Create a SKU option

added the new required request property data/relationships/market/data

request property data/type was restricted to a list of enum values

removed the request property data/relationships/market/id

removed the request property data/relationships/market/type

added the new optional request property data/relationships/tags

the type request property default value sku_options was removed

added the new sku_options enum value to the request property data/type

added the media type application/vnd.api+json for the response with the status 201