[messaging] RFC: async NaCl relay

[Max Skibinsky]

>
> But it should be done so that even when a relay node gets operated
> by the enemy, the user data should still be secure/protected.


​Thank you Mutlu. That is how relay is designed: traffic is p2p encrypted
between endpoints, and these opaque blobs are transmitted to/from relay
inside a separate session using different nacl keys (see
3.3.2
​ in the spec for details). ​Adversary taking over relay can get the meta
(which is fairly easy to obscure with fake messages to non-existent HPKs)
but not communication contents between endpoints.
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