Add external LEDs to allow users to control the color through programs

[XXLiu-HNU]

Describe problem solved by the proposed feature

Hello everyone, when I am using px4 for development, I hope to add an LED light strip to better reflect the status of the drone's mission.
For example, when my onboard computer is performing mission A, I hope to set the LED to color A through mavros, and when performing mission B, set the LED to color B...

I have learned about WS2812, but I don't know how to use the flight control port to switch to silver

Describe your preferred solution

Maybe you can control the signal by controlling a certain port of PX4.

Describe possible alternatives

Or use PWM directly for control？

Additional context

No response