Support for Xiao RP2350

[scarolan]

This already supports Micropython and shouldn't require massive effort to port. I can help test if anyone's interested in building this.
https://www.seeedstudio.com/Seeed-XIAO-RP2350-p-5944.html

[tannewt]

Do you know what USB PID they use? Do you have one already?

[scarolan]

Not yet but I may order a few...

[tannewt]

Draft PR for this is here: #9532

[jepler]

#9532 has been merged