PingPong sends ping-pongs across the signaling connection via the
SignalingClient. It measures the round-trip time between the client ping
and server pong and acts as a heartbeat to keep the underlying WebSocket
Adds observer to receive callbacks for pong events.
Iterates through each observer, so that their notification functions may
Removes observer to stop receiving callbacks for pong events.
Starts sending pings on an interval and receiving pongs.
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