fix: merge Encode/DecodeStats into PerformanceStats

Author: oliverlaz

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

@@ -401,19 +401,18 @@ enum AppleThermalState {
   APPLE_THERMAL_STATE_CRITICAL = 4;
 }
 
-// EncodeStats represents the encoding statistics for a track.
-message EncodeStats {
+// PerformanceStats represents the encoding/decoding statistics for a track.
+message PerformanceStats {
+  // The type of the track (e.g., audio, video).
   TrackType track_type = 1;
+  // The codec used for encoding/decoding the track.
   Codec codec = 2;
+  // The average encode time in milliseconds (for the publisher).
   float avg_frame_encode_time_ms = 3;
-  float avg_fps = 4;
-}
-
-// DecodeStats represents the decoding statistics for a track.
-message DecodeStats {
-  TrackType track_type = 1;
-  Codec codec = 2;
-  float avg_frame_decode_time_ms = 3;
-  float avg_fps = 4;
-  VideoDimension video_dimension = 5;
+  // The average decode time in milliseconds (for the subscriber).
+  float avg_frame_decode_time_ms = 4;
+  // The average frame rate in frames per second (FPS).
+  float avg_fps = 5;
+  // the video dimensions (width and height in pixels) of the track.
+  VideoDimension video_dimension = 6;
 }