hpke: compress query string #4147
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Summary
Add a v2 HPKE mechanism that compresses the query string using zstd. Zstd is similar to Gzip but faster. We use the highest compression ratio. Using the Apple IDP I saw a decrease from 3k to 2k in request URL size.
The authenticate service will respond using the hpke version that was used by the client. So this should be backwards compatible with v22 clients.
Related issues
Checklist
improvement/bug/ etc)