Add support for WeAct RP2350B core board.

[tjko]

I was testing RP2350B using this "breakout" board:
https://github.com/WeActStudio/WeActStudio.RP2350BCoreBoard/blob/main/HDK/RP2350B_PINOUT.png

Since there was no support for it I created board definition file for it: #2570

[lurch]

Linked PR has been merged into develop