Function eval_periodic_values 

pub fn eval_periodic_values<F, EF>(
    periodic_columns: &[Vec<F>],
    z_k: EF,
) -> Vec<EF>
where
    F: TwoAdicField + Ord,
    EF: ExtensionField<F>,

Evaluate periodic columns at a point by computing the polynomial in coefficient form via inverse DFT, then evaluating with Horner’s method.