Use a gradual shape-type for the AudioData type alias

[jorenham]

I noticed that you're using shape-typing for numpy ndarray types; awesome!

One thing that could help avoid some annoying typing errors, is to use tuple[Any, ...] instead of tupleint, ...] to represent an unknown shape type. That's because tuple[int, ...] is only assignable to tuple[int, ...] and not to e.g. tuple[int]. That's why there's tuple[Any, ...], which doesn't have this issue; it's assignable to tuple types of any length. So with this "gradual" shape-type, users no longer have to explicitly cast it to the "actual" shape type in their code (or # type: ignore it).

FWIW; recent versions of numpy (>=2.1) also use tuple[Any, ...] as shape-type of numpy.typing.NDArray for this reason.