Support the RGB LED used on the ESP32-C3-DevKitM-1

[docbacardi]

Missing feature

The ESP32-C3-DevKitM-1 has an SK6812 RGB LED which does not respond to the WS2812 module.
The timings in the WS2812 module are currently hard-coded. If they could be defined by the user somehow, it would be possible to use the module also for other RGB LEDs.

This continues the discussion in #3509 .

Please note that I do not have any evil plans to rename the module.

Justification

It would be great if the peripherals on a widely available ESP dev kit could be used right away with nodemcu.

Workarounds

No workarounds, but I have a patch for the current dev-esp32 branch.