Implement `wait gpio` for idx >= 32

[jepler]

An instruction like wait 0 gpio N refers to the absolute GPIO number. sdk pioasm tracks which numbers have been used in 16-bit blocks, reporting an error if pins in the "low" and "high" ranges are both used. This is a bit funky and it's not clear what the behavior should be. sdk pioasm gives some weird results, which I reported as an issue: raspberrypi/pico-sdk#2141

[jepler]

The necessary work has been done in pico-sdk develop version: raspberrypi/pico-sdk#2265

we still need to decide how this looks in circuitpython. For pioasm, the main thing to do is accept GPIO numbers 32..47, mask off the top bit when creating the instruction, and pass the full numbers through a new kwarg that the core will need to accept and check.