[RSDK-9931] Let the config have an optional maximum bounding box

[penguinland]

The intention here is that if the camera provides a corrupted frame and everything suddenly goes gray for a moment, that shouldn't count as motion. This also means that if someone bumps the camera and the entire scene shifts to the left, that also shouldn't count as motion.

Tried on an Orin Nano: seems to work! edit: if I don't mention it in the config, the behavior seems unchanged, and if I do mention it, large bounding boxes do not appear, while small ones still do. I was unable to get a corrupted image, so can't ensure that those are no longer considered noise.

I've also made some other cleanup changes:

• Remove trailing whitespace. Ideally we'd never have any to begin with
• Don't raise raw Exceptions, because the only way to catch them is to catch all exceptions. Instead, raise something specific (in these cases, I went with ValueError, but could be convinced of other types, too).

My hope is that reviewing commit-by-commit is easy, and makes it clear why each change occurred.

[penguinland]

...this time with not just the old tests passing, but new tests that also pass!

[kharijarrett]

LGTM!