Filling out some messages that are unlikely to change in v2. (#1137)

* Filling out some messages that are unlikely to change in v2.

* generated protobuf

* comment

* mage

* generated protobuf

---------

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

Author: boks1971

livekit/livekit_models.pb.go

@@ -293,6 +293,7 @@ message DataPacket {
 }
 
 message ActiveSpeakerUpdate {
+  option deprecated = true;
   repeated SpeakerInfo speakers = 1;
 }
 

livekit/livekit_rtc.pb.go

@@ -23,9 +23,9 @@ import "livekit_models.proto";
 
 message SignalRequest {
   oneof message {
-    // initial join exchange, for publisher
+    // participant offer for publisher
     SessionDescription offer = 1;
-    // participant answering publisher offer
+    // participant answering subscriber offer
     SessionDescription answer = 2;
     TrickleRequest trickle = 3;
     AddTrackRequest add_track = 4;

livekit/livekit_rtc_v2.pb.go

@@ -50,6 +50,8 @@ message Signalv2ClientMessage {
 
   oneof message {
     ConnectRequest connect_request = 2;
+    SessionDescription publisher_sdp = 3; // SDP offer for publisher peer connection
+    SessionDescription subscriber_sdp = 4; // SDP answer for subscriber peer connection
   }
 }
 
@@ -58,6 +60,10 @@ message Signalv2ServerMessage {
 
   oneof message {
     ConnectResponse connect_response = 2;
+    SessionDescription publisher_sdp = 3; // SDP answer for publisher peer connection
+    SessionDescription subscriber_sdp = 4; // SDP offer for subscriber peer connection
+    RoomUpdate room_update = 5;
+    ParticipantUpdate participant_update = 6;
   }
 }