toAddress method
Converts the multisig public key to a Sui address.
Implementation
@override
SuiAddress toAddress() {
  return SuiAddress(SuiAddrEncoder().encodeMultisigKey(
      pubKey: publicKeys
          .map((e) => SuiPublicKeyAndWeight(
              publicKey: e.publicKey.publicKey, weight: e.weight))
          .toList(),
      threshold: threshold));
}