add a qlog tracer for events outside of QUIC connections #4305
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By attaching a qlog tracer to the
Transport
, it's now possible to log QUIC events that don't belong to any particular connection. For example, this could be Version Negotiation and Retry packets that we send, packets that we can't associate with any connection, etc.It also allows using the
Debug
function on thelogging.Tracer
to dig deeper into unexpected behavior happening in a server.