[VID-451] introduce rtc stats and reconnect reason (#1026)

Author: thesyncim

protobuf/video/sfu/event/events.pb.go

@@ -195,6 +195,8 @@ message ReconnectDetails {
   string from_sfu_id = 6;
   // only set in case of rejoin
   string previous_session_id = 7;
+  // the reconnect reason
+  string reason = 8;
 }
 
 message Migration {

protobuf/video/sfu/event/events.proto

@@ -80,6 +80,7 @@ message SendStatsRequest {
 
   Telemetry telemetry = 11;
   models.RTMPIngress rtmp = 12;
+  string rtc_stats = 13;
 }
 
 message SendStatsResponse {