Add `DrawScope.drawCircle`

[EpicDima]

A couple of pictures

---

• [X] CHANGELOG.md's "Unreleased" section has been updated, if applicable.

[JakeWharton]

So this looks fine as far as the code goes.

I guess my only question is... would someone actually use this? Circles on a monospace grid don't seem all that useful.

I could see someone using braille characters (a little like https://chipaca.com/en/2024/01/xbmbraille/), but I don't want to provide that in the core. I'd be open to another module with braille-shape drawing primitives, though.