Support for number plate data in metadata object when vehicle smart motion triggered
**Is your feature request related to a problem? Please describe:**
No.

**Describe the solution you'd like:**
When vehicle smart motion events are sent to MQTT they are omitting number plate data. It would be great to have a new topic dedicated for smart motion events that contain vehicle number plates.

Currently the payloads only seem to contain the following information when a vehicle smart detection event is seen.

{"type":"smartDetectZone","start":1678811143195,"score":88,"smartDetectTypes":["vehicle"],"smartDetectEvents":[],"metadata":{},"camera":"63e8efbb00a49a03e4000d40","partition":null,"user":null,"id":"6410a00b013bab03e4004cac","modelKey":"event"}