getFullContractState method
Get full contract state of address and return FullContractState or throw error
Implementation
@override
Future<FullContractState?> getFullContractState(Address address) async {
  if (_disposed) throw TransportCallAfterDisposeError();
  return mutex.protectRead(() async {
    final res =
        await transport.getFullContractState(address: address.address);
    return res == null ? null : FullContractState.fromJson(jsonDecode(res));
  });
}