fix: switch to float for averaged values (#1090)

Author: oliverlaz

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

@@ -405,15 +405,15 @@ enum AppleThermalState {
 message EncodeStats {
   TrackType track_type = 1;
   Codec codec = 2;
-  int64 avg_frame_encode_time_ms = 3;
+  float 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;
+  float avg_frame_decode_time_ms = 3;
+  float avg_fps = 4;
   VideoDimension video_dimension = 5;
 }