Changes to Verify login step for multi factor authentication (MFA).

added the new LOGIN_VERIFICATION_REQUIRED enum value to the error_type response property for the response status 403

added the new USER_SELF_SUSPENDED enum value to the error_type response property for the response status 403

added subschema #1: token_response subschema #2: token_v2_response to the response body oneOf list for the response status 201

the response's body type changed from no type to object for status 201

removed the required property stop from the response with the 201 status

removed the required property token from the response with the 201 status

removed the optional property factor from the response with the 201 status

removed the optional property nemid_session_id from the response with the 201 status

removed the optional property redirect_url from the response with the 201 status

removed the optional property verify from the response with the 201 status

endpoint added