feature request: more ergonomic `Voxels::new`

`Voxels::new` and `Voxels::from_points` both take a slice of coordinates, when, in their current implementations, they only need to iterate them.

This means that if you have an iterator of points, you have to collect into a `Vec` first, causing an unnecessary allocation.

Would it be possible to have these functions take an `Iterator` instead? I don't think this would be a breaking change, since slices implement `Iterator` anyway.

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~~Possibly related: would it be possible to have a function to create a `Voxels` from chunks? (like `Voxels::from_chunks(voxel_size: Vector, chunks: impl Iterator) -> Voxels`. That could be more efficient for someone who already has the voxels in chunk form (and with the same chunk size as parry), although I appreciate that the chunks may be an implementation detail that you might not want to expose more.~~

~~I'll write an implementation, and some benchmarks for that when I have the time.~~

Edit: my benchmarks have shown only a slight speed improvement from creating from chunks, probably not worth adding.