fix(tracex): generate archival from single transaction-done event #780
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Tracex contained some fragile code that assembled HTTP measurements
from scattered events, which worked because we were sure we were
performing a single measurement at any given time.
This diff restructures the code to emit a transaction-start and a
transaction-done events only. We have basically removed all the other
HTTP events (which we were not using). We kept the transaction-start,
though, because it may be useful to see it when reading events. In
any case, what matters here is that we're now using the transaction-done
event alone to generate the archival HTTP measurement.
Hence, the original issue has been addressed. We will possibly
do more refactoring in the future, but for now this seems sufficient.
Part of ooni/probe#2121