Add WPT for Compression Dictionary Transport

Bug: 1413922
Change-Id: I4f7aad71a043354f5c107a301b66d58a1409ef89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5401505


Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Patrick Meenan <pmeenan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1281548}