Dynamic Table support for HTTP/3

[jkotalik]

Right now, we don't support dynamic table updates in HTTP/3. Thought it isn't required by spec, it could significantly help with performance in the long run for HTTP/3. See https://tools.ietf.org/html/draft-ietf-quic-qpack-16. From what I can tell, chromium doesn't create these streams by default as well.

• Encoder
  • Dynamic Table capacity
  • Insert with Name Reference
  • Insert without Name Reference
  • Duplicate
• Decoder
  • Section ack
  • Stream Cancellation
  • Insert Count Increment
• Dynamic Table
  • Sizing
  • Capacity and eviction
  • Absolute indexing
  • Relative indexing
  • Post base indexing
• Add HeaderTableSize setting (internal -> public)

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.