* we don't want to include the full origin address in each message,
only the UID
* that means that the restarted receiving system can't initate a
new handshake immediately when it sees message from unknown origin
* instead we inject HandshakeReq from the sending system once in a while
(1 per second) which will trigger the new handshake
* any messages that arrives before the HandshakeReq are dropped, but
that is fine since the system was just restarted anyway
* note that the injected handshake is only done for active connections,
when a message is sent
* also changed the UID to a Long, but there are more places in old remoting
that must be changed before we actually can use a Long value
fix lost first message, #20566
* the first message was sometimes dropped by the InboundHandshake stage
because it came from unknown origin, i.e. the handshake had not completed
* that happended because the ordinary messagage arrived before the
first HandshakeReq, which may happen since we sent the HandshakeReq
over the control stream
* this changes so that HandshakeReq is sent over the same stream, not
only on the control stream and thereby the HandshakeReq will arrive
before any other message
* always send HandshakeReq as first message
* also when the handshake on sender side has been completed at startup
* moved code from preStart to onPull
* because FQCN can become a problem for rolling upgrade scenarios
where you want to rename serializer classes
* also renamed classManifest to manifest because it doesn't have
to be class names
* CodecBenchmark that tests encode, decode and combined
encode + decode
* refactoring of codec stages to make it possible to
run them without real ArteryTransport
* also fixed a bug in inbound stream for large messages,
it was using wrong envelope pool
* First stab at separate large message channel for Artery
* Full actor paths, no implicit "/user/" part
* Various small fixes after review
* Fixes to make it work after rebasing
* Use a separate EnvelopeBufferPool for the large message stream
* Docs for actorSelection not sending through large message stream
* caching of actor refs in Encoder, Decoder
* dynamicAccess.getClassFor in Serialization is costly,
so introduced a cache for the class manifests there
