LAPI-675: Update server go emit new-producer; Update client to handle this event

public/index.js

@@ -95,6 +95,10 @@ setTimeout(() => {
       }
       if (IS_PRODUCER && urlParams.get('testing') === 'true') { getLocalStream() }
     })
+
+    socket.on('new-producer', ({ callId }) => {
+      console.log(`🟥 new-producer | callId: ${callId}`);
+    })
   }
   
   if (IS_PRODUCER === true) {