tree a0ab65c0c8d9b48a8281b33e059a29937a2e53a6
parent 166f8ac5a0332c1f200fa24c4edcef4600e9b215
author vasilvv <vasilvv@google.com> 1687363424 -0700
committer Copybara-Service <copybara-worker@google.com> 1687363477 -0700

Enforce that WEBTRANSPORT_STREAM is always sent at the beginning of the stream if draft-07 or later is used.

This also fixes the way parsing WEBTRANSPORT_STREAM is enabled. Currently, we enable it iff the local peer is willing to use WebTransport (which is incorrect).  After this CL, the code follows the following (correct and tested) logic:
0. Always wait for peer SETTINGS to be available.
1. If WebTransport is not supported, WEBTRANSPORT_STREAM is treated as a regular frame.
2. If WebTransport is at draft-02, WEBTRANSPORT_STREAM can occur at any position of the stream.
3. If WebTransport is at draft-07 or later, WEBTRANSPORT_STREAM can only occur at the beginning of the stream.

PiperOrigin-RevId: 542272544