Gremlin .NET: Exception from sync execution gets wrapped in AggregateException

When getting a server side exception and executing a traversal synchronously (ie: Next(), ToList(), ...), Gremlin.Net throws the original exception wrapped in a AggregateException, which is not desired.

This is caused by the Task.Wait() call on RemoteStrategy.Apply() method.

We should catch the wrapped exception and throw the original.