[tor-bugs] #30644 [Core Tor/Tor]: Add our own base-64 encoded ed25519 public key in dirserv_add_own_fingerprint()

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#30644: Add our own base-64 encoded ed25519 public key in
dirserv_add_own_fingerprint()
--------------------------+------------------------------------
 Reporter:  teor          |          Owner:  neel
     Type:  enhancement   |         Status:  needs_revision
 Priority:  Medium        |      Milestone:  Tor: 0.4.2.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  tor-ed25519   |  Actual Points:
Parent ID:  #22029        |         Points:
 Reviewer:                |        Sponsor:
--------------------------+------------------------------------

Comment (by neel):

 I have added a test, but it uses the same branch with the #22029 commits.

 The test is in commit: `84d95f3`.

 I am unable to do this PR separate from the #22029 commits because #22029
 introduces the ed25519 key handling.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30644#comment:7>
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