add can_manage_agent_session ParticipantPermission (#1390)

Author: theomonnom

livekit/livekit_models.pb.go

@@ -126,8 +126,10 @@ message ParticipantPermission {
   bool agent = 11 [deprecated = true];
   // if a participant can subscribe to metrics
   bool can_subscribe_metrics = 12;
+  // if a participant can manage an agent session via RemoteSession (control and access state)
+  bool can_manage_agent_session = 13;
 
-  // NEXT_ID: 13
+  // NEXT_ID: 14
 }
 
 message ParticipantInfo {