check if measure attrs were send in ngsiv2 format

[AlvaroVega]

fix for #1671

[AlvaroVega]

time=2024-11-28T13:48:59.668Z | lvl=DEBUG | corr=fafc6555-98b8-4b8a-bed4-2a05624eea59 | trans=fafc6555-98b8-4b8a-bed4-2a05624eea59 | op=IoTAgentNGSI.Entities-v2 | from=n/a | srv=smartcity | subsrv=/ | msg=sendUpdateValueNgsi2 loop with: entityName=thing:disp1, measures={"measure_id":"disp3","measure_type":"thing","TimeInstant":{"type":"DateTime","value":"2023-11-15T15:52:32.313Z","metadata":{}},"battery":{"type":"Number","value":30,"metadata":{}},"flow":{"type":"Number","value":2,"metadata":{}},"volume":{"type":"Number","value":6,"metadata":{}},"battery2":{"type":"Number","value":30,"metadata":{}}},

In this case TimeInstant measure attribute value is not a single value, is an object like:

{"type":"DateTime","value":"2023-11-15T15:52:32.313Z","metadata":{}}