[tor-bugs] #15244 [Tor]: Add helper functin that validates a .onion address

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#15244: Add helper functin that validates a .onion address
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     Reporter:  dgoulet      |      Owner:  dgoulet
         Type:  enhancement  |     Status:  new
     Priority:  normal       |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor          |    Version:
   Resolution:               |   Keywords:  tor-hs
Actual Points:               |  Parent ID:
       Points:               |
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Comment (by yawning):

 Since I'm partly to blame for requesting this, this is also a future-
 proofing measure so that when we do move to Ed25519 onions, we don't have
 a ton of slightly different ".onion" validation checks in our code that
 all need to be changed.

 Also #6411 will use this.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15244#comment:4>
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