Add hash method to Rect and Box to enable caching

[Niels-NTG]

I've implemented a __hash__ to both Rect and Box. This allows the results of functions that use these types in their arguments to be cached when using @functools.cache annotation with the function.

Here is a (be it somewhat trivial) example:

@functools.cache
def isRectinRect(rectA: Rect, rectB: Rect) -> bool:
    return (
        rectB.begin.x >= rectA.begin.x and
        rectB.begin.y >= rectA.begin.y and
        rectB.end.x <= rectA.end.x and
        rectB.end.y <= rectA.end.y
    )

By hashing rectA and rectB the result of this function can be cached for any combination of arguments, meaning that it can skip over re-calculating the results if the combination of arguments is already cached.

[avdstaaij]

Very nice!