[metrics-bugs] #25742 [Metrics/Onionoo]: add more metadata about relays: #1 DNSSEC validation, #2 DNS server

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#25742: add more metadata about relays: #1 DNSSEC validation, #2 DNS server
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     Reporter:  cypherpunks      |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Onionoo  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 It would be great to show relay operators more information about what they
 could improve on their relay configuration. In the area of exits and DNS
 this could be:

 - DNSSEC
 - do not use Google, Cloudflare, Quad9,.. DNS server

 To support this we would first need two new onionoo fields before adding
 indicators to Relay Search. Both fields are only relevant for exit relays.

 dnssec_validation: boolean
 True if the exit relay does validate

 dns_resolver: string
 PTR record for the IP address used to resolve a hostname via this exit.

 To collect the data you could run exitmap's dnssec and dnsenum modules
 once every ~12 hours.

 https://github.com/NullHypothesis/exitmap/blob/master/src/modules/dnssec.py
 https://github.com/NullHypothesis/tor-dns/blob/master/code/resolvers-of-
 exit-relays/dnsenum.py

 context:
 https://twitter.com/nusenu_/status/983302939258138626

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25742>
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