Function nash_mpc::client::fill_rpool_secp256k1

pub fn fill_rpool_secp256k1(
    own_dh_secrets: Vec<Secp256k1Scalar>, 
    other_dh_publics: &[Secp256k1Point], 
    paillier_pk: &EncryptionKey
) -> Result<(), ()>

fill pool of random and nonce values for secp256k1 as well as random values for Paillier