start implementing algorithm traits on both arrays and scalars

[kylebarron]

For the rust bindings, now that the wrappers are implemented in terms of traits, it allows us to do cool stuff like avoiding dealing with Broadcastable... and just calling them on array or scalar objects directly:

fn point_array() -> PointArray {
    todo!()
}
fn point<'a>() -> Point<'a> {
    todo!()
}
fn tmp() {
    let point_array = point_array();
    let point = point();
    let a = point_array.euclidean_distance(&point_array);
    let b = x.euclidean_distance(&point);
}

The other bindings will need to still have some sort of Broadcastable object