qlog: disentangle the ConnectionTracer from the qlog writer #4300
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The qlog writer simply records events, puts them into a channel, and consumes these events in a separate Go routine (by serializing them).
The
ConnectionTracer
is the one generating those events.This will make it possible to export qlog using a
Tracer
(i.e. for events that don't belong to any connections), and it paves the way for serializing qlog events outside of the quic package (see #4124).