WIP: Swindle CH32V003 support

 It has been a long time this has been on my todo list.

I made the sw breakpoint framework a while back because i knew i would need it for that.

Same for the RISCV flashstub framework.


So with the assistance of deepseek/gemini to speed things up : Load and debug CH32V003 chip


And it works, with breakpoints and everything :

It is still early and a bit slow.

Important: 

- You ABSOLUTELY need a 1kB pullup on the IO pin (same pin used for SWDIO or RVIO). That should not be a problem when debugging CH32V23 or Arm chip.

- Only RP2040 host for the moment


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