[tor-bugs] #22147 [Metrics/Atlas]: add exit_addresses onionoo field

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#22147: add exit_addresses onionoo field
---------------------------+-----------------------------
 Reporter:  cypherpunks    |          Owner:  cypherpunks
     Type:  enhancement    |         Status:  accepted
 Priority:  Medium         |      Milestone:
Component:  Metrics/Atlas  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:                 |  Actual Points:
Parent ID:                 |         Points:
 Reviewer:                 |        Sponsor:
---------------------------+-----------------------------
Changes (by cypherpunks):

 * status:  new => accepted
 * owner:  irl => cypherpunks


Comment:

 Replying to [ticket:22147 cypherpunks]:
 > Ideally display them similarly to the entries in the MyFamily lists.
 I don't think this is ideal because it would be inconsistent with the
 style of the OR and Dir addresses fields.

 Regarding the implementation of this feature, the Onionoo documentation on
 the `exit_addresses` field states it is an
 >[a]rray of IPv4 or IPv6 addresses that the relay used to exit to the
 Internet in the past 24 hours. IPv6 hex characters are all lower-case.
 Only those addresses are listed that are different from onion-routing
 addresses. Omitted if array is empty.
 This means exit relays that use the same address(es) for both OR and
 exiting have no `exit_addresses` field. Showing the field as empty (or
 `none` as is common for empty fields in Atlas) is confusing IMO. I plan to
 solve this confusion by merging the `or_addresses` and `exit_addresses`
 field and using the result for displaying the exit addresses.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22147#comment:2>
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