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First cut at a circuit launcher for onion services

Nick Mathewson requested to merge nickm/arti:build_hs_circuits into main

This branch adds:

  • The ability for CircMgr to launch an unmanaged circuit.
  • New circuit purposes for "the first 3 hops of an onion service circuit".
  • An HsCircPool type to handle preemptively creating a bunch of 3-hop circuits, and extending them to their 4th hops as needed.
  • A huge pile of TODO comments about issues to fix up... later, I hope.

I'd like guidance from the reviewer about which (if any) TODOs are must-fix-before-merge, and suggestions about testing strategy here.

Implements #691 (closed).

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