[VID-451] expose fps and decode/encode time (#1086)

combine publisher and subscriber rtc stats

Author: thesyncim

protobuf/video/sfu/models/models.pb.go

@@ -399,4 +399,21 @@ enum AppleThermalState {
   APPLE_THERMAL_STATE_FAIR = 2;
   APPLE_THERMAL_STATE_SERIOUS = 3;
   APPLE_THERMAL_STATE_CRITICAL = 4;
-}
+}
+
+// EncodeStats represents the encoding statistics for a track.
+message EncodeStats {
+  TrackType track_type = 1;
+  Codec codec = 2;
+  int64 avg_frame_encode_time_ms = 3;
+  int64 avg_fps = 4;
+}
+
+// DecodeStats represents the decoding statistics for a track.
+message DecodeStats {
+  TrackType track_type = 1;
+  Codec codec = 2;
+  int64 avg_frame_decode_time_ms = 3;
+  int64 avg_fps = 4;
+  VideoDimension video_dimension = 5;
+}