Attempt at adding support for Waveshare RP2350B-Plus-W

[Lannakin]

I've done my best to follow the guide for contributing and:

Edited makeboards.py, although I am not sure if I understood what these parameters should be:

    elif name == "waveshare_rp2350_plus_w":
        BuildFlashMenu(name, chip, 4*1024*1024, [*smallfs, 1024*1024, 2*1024*1024, 3*1024*1024])
        BuildFlashMenu(name, chip, 16*1024*1024, [0, 15*1024*1024, 14*1024*1024, 12*1024*1024, 

(I do not know if the first BuildFlashMenu is correct to be included)
I also was unsure of what parameters 6, 7, and 10 should be, as the number I got for the device ID via udevadm attributes walk is quite different from the others' IDs (but the manufacturer code matched so).

MakeBoard("waveshare_rp2350_plus_w", "rp2350", "Waveshare", "RP2350 Plus W", "0x2e8a", "0x0009", 500, "WAVESHARE_RP2350_PLUS_W", 16, 0, "none", ["PICO_CYW43_SUPPORTED=1", "CYW43_PIN_WL_DYNAMIC=1"])

I guess the 7th parameter is power in mA? The schematic says the LDO is ME6217C33M5G, and the datasheet for that says it can output 800mA (this LDO is also used on the Waveshare RP2350B-Eth and RP2350B-Tiny), so I guess I'll update that and rerun the script.

I also added digital.cpp, pins_arduino.h, and init.cpp. The comments at the top of digital.cpp and pins_arduino.h include the datasheets I used as references.

[Lannakin]

Note: updated the pwr parameter in makeboards.py and reran the script.

[earlephilhower]

Quick glance at this looks good. Have you tried a few things on your board w/it yet? Thx!