RTCStats

Java version of webrtc::RTCStats. Represents an RTCStats object, as described in https://w3c.github.io/webrtc-stats/. The `id`, `timestampUs` and `type` accessors have the same meaning for this class as for the RTCStats dictionary. Each RTCStatsReport produced by getStats contains multiple RTCStats objects; one for each underlying object (codec, stream, transport, etc.) that was inspected to produce the stats.