Feature: Ability to trigger events from converters on incoming Zigbee messages

[slugzero]

This is the complementing z2m PR for Koenkk/zigbee-herdsman-converters#6869. CI will pass once that one is merged.

It introduces a new meta.deviceExposesChanged() which converters can call from inside fromZigbee convert() to request a re-evaluation and re-publishing of a dynamic expose()

The DevicesChanged event is emitted to publish zigbee2mqtt/bridge/devices). I had to add another new emitExposesChanged event for the Home Assistant extension, because I did not want to change its behavior too much: The only event that leads to force-sending out a new discovery message is DeviceOptionsChanged.

[Koenkk]

Thanks!