Remote connection improvements

[alexdima]

• adds a diagnosis mechanism to all sockets.
• fixes a problem in WebSocketNodeSocket where a compressed frame followed by an uncompressed frame might be delivered out-of-order (unit test added).
• removes KeepAlive messages from the protocol and no longer uses that as a mechanism to detect socket timeout
• relies now solely on sent messages and their acknowledgement to detect a socket timeout. The socket will timeout only if there is at least one unacknowledged sent message and no server data has been received in 20s.
• fixes Zlib error: invalid distance too far back #134429
  • where one or more keep alive messages would be sent by the client, and which would arrive at the server after the server called .pause() on the socket, but before the remote extension host receives the socket.
  • the resolution was to stop sending keep alive messages and rely solely on unacknowledged messages to detect disconnection.