Re: [webrtc-extensions] Allow having inactive by default codecs (#100)

how about adding an extension to the transceivers similar to the one for the rtp header extensions?

```
partial interface RTCRtpTransceiver {
  undefined setOfferedCodecs(sequence<RTCRtpCodecCapability> codecsToOffer);
  readonly attribute FrozenArray<RTCRtpCodecCapability> codecsToOffer;
  readonly attribute FrozenArray<RTCRtpCodecCapability> codecsNegotiated;
};
```

we would need to add also a property `offeredByDefault` to the `RTCRtpCodecCapability` to signal if the codec is included in an initial offer by default or not. 

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