[metrics-bugs] #26159 [Metrics/Library]: Replace Gson with Jackson in metrics-lib

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#26159: Replace Gson with Jackson in metrics-lib
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     Reporter:  karsten          |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  High             |  Milestone:
    Component:  Metrics/Library  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 Related to Onionoo ticket #25848, we should replace Gson with Jackson in
 metrics-lib.

 Otherwise, if we don't switch here, Onionoo will have to include two
 dependencies in order to parse CollecTor's `index.json` using metrics-lib
 and to format and parse its various JSON files in its `status/` and `out/`
 directories.

 Generally, we'll want to switch in other applications that depend on
 metrics-lib, and then we'll want to have a single dependency for JSON
 parsing/formatting in those applications.

 Setting priority to high, because we should ideally put out a release with
 this change in the next few days and then releases of all other
 applications by the end of this month.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26159>
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