sign method
Signs the payload
with a private key. The output will be like the
bytes representation of the eth_sign RPC method,
but without the "Ethereum signed message" prefix.
The payload
parameter contains the raw data, not a hash.
Implementation
@override
Future<Uint8List> sign(Uint8List payload,
{int? chainId, bool isEIP1559 = false}) {
throw UnimplementedError();
}