fix: experimental option to force single codec preference in the SDP

[oliverlaz]

Overview

This is a hotfix for platforms that don't respect the ordered codec list(Firefox, Android, Linux, etc.).
We remove all the codecs from the SDP except the one we want to use. This is an opt-in feature hidden behind a toggle in the call's publish options.
To enable it:

call.updatePublishOptions({
  preferredCodec: 'vp9',
  forceSingleCodec: true,
});