[tor-bugs] #20550 [Metrics/CollecTor]: implement SanitizedBridgeExtraInfoDescriptor

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#20550: implement SanitizedBridgeExtraInfoDescriptor
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     Reporter:  iwakeh             |      Owner:
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:  #20542
       Points:                     |   Reviewer:
      Sponsor:                     |
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 Create the two classes `SanitizedBridgeExtraInfoDescriptor` and
 `SanitizedBridgeExtraInfoDescriptorTest`.
 `SanitizedBridgeExtraInfoDescriptor` should extend
 `BridgeExtraInfoDescriptor` all else analogously to #20249.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20550>
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