Store const audio/video options inside RtpTransceiver on construction

Move `AudioOptions` and `VideoOptions` initialization to the
RtpTransceiver constructor. This guarantees that options cannot change
between transceiver construction and a call to CreateChannel. Remove the
options parameters from CreateChannel signature. Also clean up redundant
SetOptions calls in CreateChannel since options are already applied
during channel creation.

Bug: webrtc:42224170
Change-Id: I517b678ee248c6ce3f108bef489fbb107e446811
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/476780
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47881}