Addition of RGB-LED signalling for ESP32C3 boards

[argafal]

For reference, this was the discussion regarding the patch so far:

FastLED seems broken for ESP32C3 boards

The Lolin C3 mini works nicely. I have not encountered any problems so far. I agree that it would be nice to integrate your NeoPixel changes. Full support for a pull request. Good job, @mrickma!