qlog version_information for server

[martinthomson]

          For the server, look in `server.rs` for `fn accept_connection(...)`.  That is where a new connection is handled.  There shouldn't be a negotiated equivalent on the server, but the recording of failed version negotiation can be recorded.

For VN, you can make a call in fn process_input(...) right where it calls PacketBuilder::version_negotiation(...), which is where the Version Negotiation packet is sent. For that, you'll need to create a new QLog instance with self.create_qlog_trace(attempt_key). You will have to follow other code for that. I probably wouldn't bother trying to reduce the number of logging events from the same remote address and DCID, because that just creates a cleanup hazard.

That won't catch all cases, but enough.

Originally posted by @martinthomson in #1505 (review)