[EncodedTransform] Audio and video receiver readable and writable
This CL includes the logic for setting the RTCRtpScriptTransform to the
receiver and configuring the audio/video readable and writable through
the RTCRtpScriptTransformer.
Bug: 354881878
Change-Id: Id035f27306b2f7f2eff39a776ea24caa1be6c35f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5756530
Reviewed-by: Guido Urdaneta guidou@chromium.org
Commit-Queue: Guido Urdaneta guidou@chromium.org
Reviewed-by: Tony Herre toprice@chromium.org
Cr-Commit-Position: refs/heads/main@{#1342724}