[metrics-bugs] #23421 [Metrics/CollecTor]: use persistence functionality throughout all CollecTor modules

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#23421: use persistence functionality throughout all CollecTor modules
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     Reporter:  iwakeh             |      Owner:  metrics-team
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 As discussed in
 [https://trac.torproject.org/projects/tor/ticket/21272#comment:18 #21272
 comment:18] and before.

 All storing of files should be done by the persist-mechanism, i.e.,
 a o.t.c.persist.*Persistence classes should also be used for storing
 descriptors initially (i.e., when fetched from authorities).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23421>
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