Function to_sorted_vec

fn to_sorted_vec<HCX, T, K, I>(
    hcx: &HCX,
    iter: I,
    cache_sort_key: bool,
    extract_key: fn(_: &T) -> &K,
) -> Vec<T>
where
    I: Iterator<Item = T>,
    K: ToStableHashKey<HCX>,