[metrics-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:  metrics-team
     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:  new => needs_review


Comment:

 Please find [https://gitweb.torproject.org/user/karsten/metrics-
 lib.git/log/?h=task-22141 my branch task-22141] with an initial attempt
 towards implementing this change.  (This ticket somewhat overlaps with
 #16225, and I wasn't sure where to put this branch.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22141#comment:4>
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