[quicwg/base-drafts] Provide Signal that SCID is client assigned (#2838)

[MikkelFJ <[e-mail]>]

In QUIC v1 the first CID (OCID) is client assigned although most CID's are assigned by the authority controlling the receiving endpoint.

I propose to make it publicly visible via invariants which endpoint authored or authorized the CID. This obviously requires a change to invariants.

Such a signal could be single header bit similar to how long/short packets are identified.

It could be useful in resolving some LB issues with traffic routing in v1, but even if this is not used by v1, other QUIC versions might regret not having this signal.

Now, there is nothing in the invariants stating how CIDs are constructed, so by all means it could happen by a vote by the general british population. But, realistically, there are two endpoints and two responsible parties so it can be stated in invariants who authorized the CID even if it is unknown how or by whom.

It would require a change to invariants. But for the sanity of current and future QUIC versions, I believe it is important to know if a CID is assigned by client where a CID is normally assigned by the destinations authority.

See also discussion here: https://github.com/quicwg/base-drafts/issues/2834

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