Finish plumbing in the Ed25519 key checks. Make sure we store the claimed key
correctly in the megolm sessions, and keep them as a separate field in
MatrixEvent rather than stuffing them into _clearEvent
These list the keys that sender of the event must have ownership
of and the keys of that the sender claims ownership of.
All olm and megolm messages prove ownership of a curve25519 key.
All new olm and megolm message will now claim ownership of a
ed25519 key.
This allows us to detect if an attacker claims ownership of a curve25519
key they don't own when advertising their device keys, because when we
receive an event from the original user it will have a different ed25519 key
to the attackers.
