Custom Animation System #201

Is your feature request related to a problem? Please describe.
A custom animation system for boards that has more complex LED.

Describe the solution you'd like
I already made a solution for my own fork. 203-Systems/Matrix-bootloader-STM32@5be0be7
But I would prefer this is supported upstream.

Describe alternatives you've considered
Mentioned above,

Additional context
https://github.com/203Electronics/Matrix-Bootloader/blob/bbea776965f24ec35122fcb3a7a0941923276599/ports/espressif/boards/boards.c#L197
Add this line to make ws2812 more stable.
(Still glitches out sometimes, not sure why that is the case. I assume this has to with tinyUSB irq?)