Changes to GET /v1/legend-twaps

the response property items/items/stopPx became nullable for the status 200

the response property items/items/triggerAbove became nullable for the status 200

the response property items/items/triggerPx became nullable for the status 200

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

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

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

added the required property items/items/provider to the response with the 200 status

endpoint added