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Adds TrafficAnalysisDefenses, set through QUICConnectionOptions.trafficAnalysisDefenses. Both defenses (padding and chaff) are off by default.
Padding: Pads packets according to three options: up to a fixed size, up to a multiple of a size, or to a random size. Only ACK-eliciting application data packets are padded.
Chaff: after an idle interval, with optional jitter, sends a PING marked as chaff, padded like other packets or to full size. Chaff is held to the congestion window, waits while anything else is pending, and stops after a maximum number in a row. Lost chaff is not retransmitted.