[tor-bugs] #21889 [Core Tor/Tor]: hs: Circuitmap changes for prop224

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#21889: hs: Circuitmap changes for prop224
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     Reporter:  dgoulet        |      Owner:  dgoulet
         Type:  enhancement    |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  tor-hs, prop224
Actual Points:                 |  Parent ID:  #21888
       Points:  3              |   Reviewer:
      Sponsor:  SponsorR-must  |
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 This is part of the groundwork for service implementation of prop224
 (#20657).

 First, we need the circuitmap API to use a `circuit_t` instead of
 `or_circuit_t` so we can use it on the service side which uses
 `origin_circuit_t`.

 Second, add a service side API to track service circuits.

 Finally, refactor this API so the naming has better semantic.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21889>
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