ooni / probe-cli / 6316332524

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feat(enginenetx): add policy based on stats (#1312)

This policy first checks the stats and sorts the entries for which we
have the highest nonzero success rate. Then, we use an underlying policy
to produce additional suitable tactics for the HTTPS dialer.

There is a check preventing the same tactic from being emitted twice.
This means that, if we emit a tactic looking into the stats, we're not
going to emit the same exact tactic again when using our beacons policy
generator.

Also, because we try using stable sorting, and assuming some tactics
work, we would most likely continue using the tactics that work, until
something bad happens and we need to try and see whether other tactics
work.

While there, rename statstracker{,_test}.go to statsmanager{,_test}.go
because the type inside it is called "state manager". The state tracker
is an abstract concept only used by the https dialer code.

Part of https://github.com/ooni/probe/issues/2531

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