message: [kimchi] add a getter to shifts
diff: @@ -214,6 +214,11 @@ where
  Self { shifts, map }
  }
  + /// retrieve the shifts
  + pub fn shifts(&self) -> &[F; PERMUTS] {
  + &self.shifts
  + }
  +
  /// sample coordinate shifts deterministically
  fn sample(domain: &D<F>, input: &mut u32) -> F {
  let mut h = Blake2b::new();
  