Add firmware log event support and update trace payloads

[usrflo]

AI added a firmware log event so DEBUG output is merged into the JSON log output.
This way I can see output like the following that I didn't expect or wasn't aware of so far.
The trace output would have revealed this as well but filtering the JSON output can be done better.

1 line needs to be patched in Meshcore.h, see the modification in the patch file.
I worked on Linux but should be re-checked on Windows IMHO.

{
  "type": "LOG",
  "timestamp": "2025-01-01T00:02:02.000Z",
  "origin": "Repeater2",
  "line": "DEBUG: 00:00:00 - 1/1/2024 U Dispatcher::loop(): ERROR: send start failed!"
}
{
  "type": "PACKET",
  "timestamp": "2025-01-01T00:02:02.000Z",
  "origin": "Repeater3",
  "direction": "TX",
  "payload_hash": "841DBF8FD9CC7CEF",
  "packet_start_time_s": 122.0001,
  "packet_end_time_s": 122.399972
}