[tor-bugs] #27235 [Metrics/Onionoo]: add rpki_state field

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#27235: add rpki_state field
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     Reporter:  nusenu           |      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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 motivation:
 * bring routing security awareness and indicators to relay operators
 * increase routing security by encouraging relay operators to ask their
 ISPs for properly configured prefixes


 context:
 https://medium.com/@nusenu/how-vulnerable-is-the-tor-network-to-bgp-
 hijacking-attacks-56d3b2ebfd92

 this field should contain the following information:
 * RPKI ROA validity state for IPv4 and IPv6 (enum: NotFound, Invalid,
 Valid)
 * invalid reason for IPv4 and IPv6 (enum: 'as', 'length')

 validator software by RIPE (alternatively you can use RIPEstat, but
 running it yourself is likely a lot faster)
 https://www.ripe.net/manage-ips-and-asns/resource-management/certification
 /tools-and-resources


 depends on: #27155

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27235>
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