Function dipole_kernel_default_f32 

pub fn dipole_kernel_default_f32(
    nx: usize,
    ny: usize,
    nz: usize,
    vsx: f32,
    vsy: f32,
    vsz: f32,
) -> Vec<f32>

Generate f32 dipole kernel with default B direction (0, 0, 1)