This patch adds a StunDictionary.
The dictionary has a reader and a writer.
A writer can update a reader by creating a delta.
The delta is applied by the reader, and the ack is applied by the
writer.
Using this mechanism, two ice agents can (in the future) communicate
properties w/o manually needing to add new code.
The delta and delta-ack attributes has been allocated at IANA.
Bug: webrtc:15392
Change-Id: Icdbaf157004258b26ffa0c1f922e083b1ed23899
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/314901
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Jonas Oreland <jonaso@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40513}
b17806a4cf