[quicwg/base-drafts] Increase the size of connection ID (#1052)

[Martin Thomson <[e-mail]>]

@vasilvv raised the question on the list.

64 bits seems like a lot until you start thinking about using cryptography, adding structured information to the identifier.  When you consider collision probabilities, those 64 bits seem a little tight.  Expanding connection ID to 128 bits, which might allow a little more space and enable simple encryption strategies.

On the other hand, a 64-bit overhead on every packet is already pretty costly.  We spent a lot of effort on shaving other parts of the protocol overhead down, sometimes at a fair expense in complexity.  Doubling the size would put the overhead equivalent to our AEAD.

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