[VID-1077] Add coordinator stats capability flag to SFU proto

Author: thesyncim

protobuf/video/sfu/models/models.proto

@@ -453,4 +453,6 @@ enum ClientCapability {
   CLIENT_CAPABILITY_UNSPECIFIED = 0;
   // Enables SFU pausing inbound video
   CLIENT_CAPABILITY_SUBSCRIBER_VIDEO_PAUSE = 1;
+  // Instructs SFU that stats will be sent to the coordinator
+  CLIENT_CAPABILITY_COORDINATOR_STATS = 2;
 };