Changes to Create Key Value instance

the maintenance/id response's property type changed from no type to string for status 201

added the new 10g enum value to the plan response property for the response status 201

added the new 1g enum value to the plan response property for the response status 201

added the new 20g enum value to the plan response property for the response status 201

added the new 256mb enum value to the plan response property for the response status 201

added the new 40g enum value to the plan response property for the response status 201

added the new 5g enum value to the plan response property for the response status 201

added the new 10g enum value to the request property plan

added the new 1g enum value to the request property plan

added the new 20g enum value to the request property plan

added the new 256mb enum value to the request property plan

added the new 40g enum value to the request property plan

added the new 5g enum value to the request property plan

added the optional property code to the response with the 400 status

added the optional property code to the response with the 401 status

added the optional property code to the response with the 404 status

added the optional property code to the response with the 429 status

added the optional property code to the response with the 500 status

added the optional property code to the response with the 503 status

the maintenance/id response's property pattern ^mrn-[0-9a-z]{20}$ was added for the status 201