[quicwg/base-drafts] Explicit support for on-path calculation of loss and congestion of QUIC flows (#632)

[Brian Trammell <[e-mail]>]

It might be useful for on-path devices to be able to calculate the (1) loss and (2) non-loss indication of congestion (i.e., ECN) experienced by each side of a QUIC flow from a single observation point.

Since #609 essentially marks every congestion window of a QUIC flow with an alternating spin, evaluation of the time-series of congestion window sizes could allow passive analysis of congestion window reductions, from which loss can be inferred if the assumption that the sender is using loss-based congestion control is valid.

A less inference-based solution would be something like the loss bit discussed in #279.

An even more explicit way to do this would be to implement something like [ConEx](https://tools.ietf.org/html/rfc7713) in the QUIC short header. 

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