[metrics-bugs] #22640 [Metrics/metrics-lib]: Change encoding of microdescriptor digests in network status entries from hex to base64

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#22640: Change encoding of microdescriptor digests in network status entries from
hex to base64
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 Reporter:  karsten              |          Owner:  metrics-team
     Type:  defect               |         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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Comment (by iwakeh):

 The test and fix look fine.  All checks and tests pass.

 I would prefer to change the name `parseTwentyByteBase64String` into
 `verifyTwentyByteBase64String` b/c most `parse*` methods return the valid
 and sometimes changed data item (e.g. string to port int).  Maybe turn
 this into a general rule `verify*` for checking, `convert*` for explicit
 changes, and `parse*` for the returned correct data item?  (This could be
 added in `ParseHelper`s javadoc or other comment on class level.)

 Merge ready and fine for release  1.9.0

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22640#comment:2>
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