Memory leak in `remap`

[liamkinne]

There is some amount of memory being allocated during the remap function that isn't getting cleaned up.

This is with the latest commit on main. So I imagine it's something to do with rayon or the new tensor implementation.

This simple program will slowly grow in memory usage:

fn main() {
    let size = ImageSize {
        width: 1440,
        height: 1440,
    };

    let correction_map = correction_map(&size);

    loop {
        let input = Image::<u8, 3>::from_size_val(size, 0).unwrap();
        let mut output = Image::<f32, 3>::from_size_val(size, 0.0).unwrap();

        remap(
            &input.cast().unwrap(),
            &mut output,
            &correction_map.0,
            &correction_map.1,
            InterpolationMode::Bilinear,
        )
        .unwrap();
    }
}