Changes to List trending boxes

added the optional property results/items/box/eventCount to the response with the 200 status

added the optional property results/items/box/firstEventTimestamp to the response with the 200 status

added the optional property results/items/box/lastEventTimestamp to the response with the 200 status

added the optional property results/items/box/nextEventTimestamp to the response with the 200 status

endpoint added