Adding all the CH32V003s to Zephyr

kholia@ and I have been working on adding support for the low-cost CH32V003 to Zephyr, which got me wondering: how many readily available CH32V003 boards are there, and what would it be like support all of them to Zephyr?

So far I’ve ordered or built:

• Maker Go QSZNEC
• wagiminator’s CH32V003-GameConsole
• Muselab nanoCH32V003
• Unnamed CR-CH32VXXX

I skipped:

• Olimex RVPC, as the I/O is too unique and the shipping is too high
• Olimex MOD-IO2, which has two relays
• Electronicfans unnamed, as I couldn’t find the schematic.

Special mention to this board which is a CH32V003, but according to the page and pictures, also ARM, and also with 64 k of flash and 8 k of RAM.