Changes to Register as a new user (if allowed)

removed the media type multipart/form-data from the request body

api operation id register was added

the query request parameter email became optional

the query request parameter password became optional

the query request parameter username became optional

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 500

added the optional property success to the response with the 200 status

query request parameter password was deprecated

added optional request body

added the non-success response with the status 400