[tor-bugs] #22173 [Core Tor/Tor]: Support looking up node by ed25519 identity

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#22173: Support looking up node by ed25519 identity
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     Reporter:  dgoulet       |      Owner:  nickm
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Currently we can only lookup a `node_t` object using the SHA1 identity
 digest (`node_get_by_id()` and friends).

 It would be good to have a map of `node_t` indexed by ed25519 identity so
 we can look them up that way.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22173>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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