Understand code performance of onion services under DoS

We need to do the following experiments to understand more about the performance of Tor under simulated DoS conditions:

1. Get vanilla profile (for #30221 (moved)) [VANILLA profile] [Also get with INTRO2 rate limiting]

2. See effect of DoS on intro and guard [VANILLA profile] [Also with INTRO2 rate limiting]

3. Investigate control port experiment (with STREAM events enabled and trying to kill circs with CLOSECIRCUIT) [VANILLA profile] wrt ​https://lists.torproject.org/pipermail/tor-dev/2019-December/014097.html

   NEED: Controller script that logs circuit events and tries to kill some circuits [asn]

4. Investigate size of replay cache (#26294 (moved)) [VANILLA profile] [asn]

5. Investigate capacity of reestablish intro circuit (#26294 (moved)) [VANILLA profile]

6. Compare intro/rend profiles (value of prop255 / #17254 (moved)) [VANILLA profile]

7~) Investigate horizontal scaling with OB (scale to 2/4/8 instances, extrapolate onwards.) [OBv3 profile]

8~) Investigate pinned paths with HSLayer2Node HSLayer3Node [Vanguard profile]