refactor(enginenetx): introduce stats and make tactic a struct #1291
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This diff refactors the code to introduce a stats interface and to make the tactic a struct ~without methods attached.
We transform the tactic into a struct because we're planning on storing the tactics on disk and loading them.
We need stats to track what is working and choose which is the best tactic that we should employ.
In light of these two needs, it makes sense to transfer the reporting methods that previously were part of the tactic interface to stats.
With this diff, we temporarily lost the possibility of choosing which handshaker to use, which was not implemented anyway and needs some more work to reason about how we'd store this information on disk.
Part of ooni/probe#2531