[tor-bugs] #18746 [metrics-lib]: release descriptor 2.0.0

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#18746: release descriptor 2.0.0
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     Reporter:  iwakeh       |      Owner:  karsten
         Type:  task         |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  metrics-lib  |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |   Reviewer:
      Sponsor:               |
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 Parent ticket for all changes going into this release.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18746>
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