Compression Dictionary - Updated Chrome Origin Trial

FYI, Chrome 123 (currently in beta) has been updated to implement the
latest compression dictionary transport draft (03).

If you're already experimenting with it you'll need to register for a new
token
<https://developer.chrome.com/origintrials/#/view_trial/3693514644397228033>
(new trial since there were header changes since the first trial).

The previous trial was from before it was adopted by the working group so
there were a fair number of changes (all for the better, thank you).

- "Sec-Available-Dictionary" changed to "Available-Dictionary"
- The format of "Available-Dictionary" is now a SF byte stream field
(base-64 encoding of the dictionary hash, surrounded by colons) instead of
hex string
- "sbr" changed to "br-d"
- "match" is now a URLPattern (though might not require any changes)
- ttl is gone and now uses the resource expiration time
- The server can provide an "id" which is echoed as "Dictionary-ID" by the
client in future requests (instead of needing to use the dictionary hash as
a lookup key, the string is opaque to the client)
- The server needs to send "Content-Dictionary" in the response header with
the hash of the dictionary used (must match the "Available-Dictionary" from
the request)
- "match-dest" is now supported so you can do something like
match-dest="document"
and have the dictionary only be used for document requests

Thanks,

-Pat