gdoor status indication via LED

[mrtnkhl]

It would be great if the next HW revision would add a couple LEDs or a RGB LED to indicate system status.

Eg to understand if the bus is connected correctly, wifi works, mqtt works etc.

For remote and space constrained installations, this visual indication would be helpful.

[DaSchaef]

The new ESP32-S3 board of v4.0 has already a RGB LED equipped, but a bridge needs to be soldered and I think we need the corresponding I/O for audio stuff.
For a next iteration (4.1) it is possible to add LED indication on the GDoor PCB itself, in the past we skipped it to make GDoor as small as possible.