Changes to Retrieve Email Renders

added the non-success response with the status 422

added the non-success response with the status 429

the code response's property type changed from no type to string for status 400

the code response's property type changed from no type to string for status 403

the code response's property type changed from no type to string for status 404

the endpoint scheme security ApiKeyAuth was added to the API

the endpoint scheme security PermissionAuthenticationRequirement was removed from the API

api tag Emails added

added the non-success response with the status 401

endpoint added