[Feature] Connect to multiple MQTT brokers/base topics
### Problem description

I have 2 zigbee2mqtt instances running, each use a different base topic

### Suggested solution

Will be great the ability of declare more than one "mqtt" sentence in the platform 

### Alternative solutions

Have another Homebridge instance running the z2m plugin with the 2nd zigbee2mqtt base topic

### Additional context / information

_No response_