Changes to Create a tax rule

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

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

removed the request property data/relationships/manual_tax_calculator/id

removed the request property data/relationships/manual_tax_calculator/type

the type request property default value tax_rules was removed

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

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