[tor-bugs] #26337 [Core Tor/Tor]: make rust error types use the failure crate

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#26337: make rust error types use the failure crate
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     Reporter:  isis     |      Owner:  (none)
         Type:           |     Status:  new
  enhancement            |
     Priority:  Medium   |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  rust, technical-debt, tor-
     Severity:  Normal   |  modularity
Actual Points:           |  Parent ID:
       Points:  1        |   Reviewer:
      Sponsor:           |
  Sponsor8-can           |
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 As our Rust code increases, we'll eventually want a nicer way to convert
 between error types than we currently have.  We'll probably want to use
 boats's `failure`
 [https://twitter.com/0x424c41434b/status/1005185002399830023 crate].  They
 mentioned a while ago that they were going to make a 1.0.0 release soon,
 and afaict there's not really anything about the current release that is
 expected to change, so we can probably start working on this now-ish.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26337>
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