@Override
  public Optional<SyncStatus> getSyncStatus() {
    return Optional.empty();
  }
Naive implementation of Synchronizer used by retesteth. Because retesteth is not implemented in
the test module, it has no access to mockito. This class provides a minimum implementation needed
to run RPC methods which may require a Synchronizer.
ethereum/core/src/test-support/java/org/hyperledger/besu/ethereum/core/DummySynchronizer.java