Function ilsqr_with_progress 

pub fn ilsqr_with_progress<F>(
    field: &[f64],
    mask: &[u8],
    nx: usize,
    ny: usize,
    nz: usize,
    vsx: f64,
    vsy: f64,
    vsz: f64,
    bdir: (f64, f64, f64),
    tol: f64,
    maxit: usize,
    progress_callback: F,
) -> Vec<f64>
where
    F: FnMut(usize, usize),

iLSQR with progress callback