Function fruchterman_reingold

pub fn fruchterman_reingold<F, V>(
    step_fn: F,
    max_iter: usize,
    converge_eps: f32,
    k_r: f32,
    k_s: f32,
    min_pos: &V,
    max_pos: &V,
    node_positions: &mut [V],
    node_neighbors: &[Vec<usize>],
)
where
    V: Vector<Scalar = f32>,
    F: Fn(usize) -> f32,