[tor-bugs] #22141 [Metrics/metrics-lib]: Deprecate `DescriptorFile` and add relevant information to `Descriptor`

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#22141: Deprecate `DescriptorFile` and add relevant information to `Descriptor`
---------------------------------+-----------------------------------
 Reporter:  karsten              |          Owner:  karsten
     Type:  enhancement          |         Status:  needs_review
 Priority:  Medium               |      Milestone:  metrics-lib 1.9.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Changes (by karsten):

 * status:  assigned => needs_review


Comment:

 Okay, I wrote more code based on the plan mentioned earlier today.  The
 only part I left out was the `removeFromHistoryFile(File)` method, because
 I didn't find that too important on second thought.  And we could still
 add it if we need it or somebody asks for it.

 Please find [https://gitweb.torproject.org/user/karsten/metrics-
 lib.git/log/?h=task-22141 my updated task-22141 branch] with four new
 commits that might be easiest to review together as a single diff.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22141#comment:14>
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