Add MicroPython UF2 firmware for 2040 Nano XRP

[SaintSampo]

Add a binary UF2 firmware image (public/micropython/firnware2040nanoxrp.uf2) containing MicroPython for the RP2040-based Nano XRP board.

[kcq888]

Is there a signature on the board where we can identify the board? We have logic to identify the beta and non-beta board and pick the appropriate firmware to update. I am guessing that Frank will be adding something like this?

[SaintSampo]

There are a few ways it could be done. I see in commandstoxrpmgr.ts, right now the 2040/2350 are discerned by using sys.implementation

Right now I'm working on adding support for the NanoXRP in the XRP Micropython library.

I'm doing something similar, for example:

if "NanoXRP" in implementation._machine:
    drivetrain = DifferentialDrive(left_motor, right_motor, imu, wheel_diam=3.46, wheel_track=7.8)
else:
    drivetrain = DifferentialDrive.get_default_differential_drive()

I'll leave it up to Frank what he wants the convention to be, just wanted to add the UF2 in case he needs it. He was also talking about removing the UF2 files from the IDE and pulling them right from the source.