[metrics-bugs] #24166 [Metrics/Library]: Make descriptor reading stopable

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#24166: Make descriptor reading stopable
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     Reporter:  iwakeh           |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Library  |    Version:
     Severity:  Normal           |   Keywords:  metrics-2018
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 What would be the best way to not force reading of all descriptors?
 See #20412 comment:9 for background.

 Suggestion so far: create an `abortReading` method and after this method
 was called the reader's status is similar to a completed reading of
 descriptors, e.g., methods concerning stats don't throw ISEs anymore.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24166>
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