Add sdp m line index to WebRtc Ice Candidates

[sdb9696]

Proposed change

Add sdp m line index to Ice Candidates to indicate which m= line the candidate is for.

frontend PR

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[edenhaus]

Should be done in a separate PR upfront

[sdb9696]

This will break things if it goes in up front as according to spec either sdpMLineIndex or sdpMid must be set.