[tor-bugs] #20549 [Metrics/CollecTor]: implement SanitizedBridgeServerDescriptor

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#20549: implement SanitizedBridgeServerDescriptor
-----------------------------------+--------------------
     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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 `SanitizedBridgeServerDescriptor` should extend `BridgeServerDescriptor`.
 It receives a `BridgeServerDescriptor` at construction time and sanitizes
 the descriptor.
 All getters should only supply sanitized data; this explicitely includes
 method from the Descriptor interface like getRawDescriptorBytes.

 In addition, a `SanitizedBridgeServerDescriptorTest` should be created
 that verifies the sanitation and data integrity.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20549>
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