TB 44635: Gather conflux information on circuits.

TB 44635: Gather conflux information on circuits.

Proactively gather data about the circuits in TorProvider, and send the
complete information about a circuit, not only its node fingerprints.
Also, gather conflux sets, and send both conflux circuits to the
circuit display backend.

TB 44635: Gather conflux information on circuits.

Reword CircuitID to IsolationKey, for better clarity.

TB 44635: Gather conflux information on circuits.

Relay information collection now happens at the tor provider level.
So, adapt the code of TorDomainIsolator to take the data alrady
prepared.

TB 44635: Gather conflux information on circuits.

Consume only the first circuit on the circuit display.

TB 44635: Gather conflux information on circuits.

Update the getCircuit name to getCircuits.