Code format

[konsumer]

This adds prettier & clang-format to help automate code-consistency. I am not really stuck on the style for either language, so feel free to modify, I just want it to be automated & consistent. The prettier style mimics standardjs, and the clang-format is as similar as I could get it for C. For many editors (VSCode/Zed, or sublime with a plugin) this will automate fixing code (just save and it will be correct.)

[konsumer]

This fails style-check (correctly, because the code does not follow standards) but a quick fix in another commit:

npx -y prettier -c . --write

[konsumer]

I am using all prettier here, because biome (which is faster) is blocked by .editorconfig. It's a pretty small difference in speed anyway, but it does not like some of the options in our .editorconfig. Zed uses biome, as far as I know, so I am not sure why it doesn't fail there, but it's probly a safer bet to use prettier, anyway, since it's more mature.