[metrics-bugs] #27155 [Metrics/Onionoo]: add ipv4_bgp_prefix ipv6_bgp_prefix fields

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#27155: add ipv4_bgp_prefix ipv6_bgp_prefix fields
---------------------------------+--------------------------
     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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 Use case:
 * find relays in the same prefix (for example if a specific prefix has
 been hijacked)
 * group relays by prefix
 * is a requirement fore routing security related metrics (ROA, prefix
 length)


 The RIPEstat API can be used as a source and you can cache it if previous
 lookups were within the same /24 (IPv4) or /48 (IPv6) since that is the
 longest prefix length
 https://stat.ripe.net/docs/data_api#NetworkInfo
 example:
 https://stat.ripe.net/data/network-info/data.json?resource=140.78.90.50


 related: #26585

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27155>
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