targets: add support for Pimoroni Tiny2350 board

[deadprogram]

This PR adds support for the Pimoroni Tiny2350 board

https://shop.pimoroni.com/products/tiny-2350

[github-actions]

Size difference with the dev branch:

Binary size difference

not the same command!
    tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
    go: downloading tinygo.org/x/tinyfont v0.3.0
 flash                          ram
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  16724   16724      0   0.00%    4172    4172      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
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[deadprogram]

Thanks for review @aykevl now merging.