NB_FatFS: Asynchronous/Polling FatFs Api for embedded

[stimpacker]

I redid FatFS to work async or in polling mode. Works well on my STM32H755zi, on CM4. Most functions are enabled, though I didnt do all of them. Maybe plan on adding them later if there is any interest.

Figured I'd share since not having an async FatFS library was a big peeve for me.

https://github.com/Snolandia/NB_FatFS