[metrics-bugs] #34224 [Metrics/Onionperf]: Update analysis results file version to 2.0

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#34224: Update analysis results file version to 2.0
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     Reporter:  karsten            |      Owner:  metrics-team
         Type:  defect             |     Status:  new
     Priority:  High               |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:  0.2                |   Reviewer:
      Sponsor:                     |
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 We added a new field to the analysis results file format in #26673, but we
 did not yet increment the format version number. The current version field
 is a floating point number, which doesn't work well for versioning. We
 should use a version string here. Given that this change alone is going to
 be backward-incompatible, we'll have to call the new version 2.0. I'm
 preparing a patch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34224>
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