Changes to List emails

the endpoint scheme security Bearer-Auth was added to the API

api tag Emails added

api tag Design Studio emails removed

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

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

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

api tag Design Studio emails added

api tag Design Studio removed

the errors/items/status response's property type changed from integer to string for status 400

the errors/items/status response's property type changed from integer to string for status 401

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