Changes to Create a server-managed chase order

the response property chaseOrder/currentOrderId became nullable for the status 200

the response property chaseOrder/currentPrice became nullable for the status 200

the response property chaseOrder/error became nullable for the status 200

response property chaseOrder/currentOrderId list-of-types was narrowed by removing types null from media type application/json of response 200

response property chaseOrder/currentPrice list-of-types was narrowed by removing types null from media type application/json of response 200

response property chaseOrder/error list-of-types was narrowed by removing types null from media type application/json of response 200

endpoint added