Enable/disable opentelemetry based on config/user preference

Add config to set collector URL, obey the same analytics setting as
posthog. Also refactor into a class to make it easier to manage.

src/room/GroupCallInspector.tsx

@@ -383,7 +383,7 @@ function useGroupCallState(
         memberStateEvents,
       });
 
-      otelGroupCallMembership.onUpdateRoomState(event);
+      otelGroupCallMembership?.onUpdateRoomState(event);
     }
 
     function onReceivedVoipEvent(event: MatrixEvent) {
@@ -393,7 +393,7 @@ function useGroupCallState(
     function onSendVoipEvent(event: VoipEvent) {
       dispatch({ type: CallEvent.SendVoipEvent, rawEvent: event });
 
-      otelGroupCallMembership.onSendEvent(event);
+      otelGroupCallMembership?.onSendEvent(event);
     }
 
     function onUndecryptableToDevice(event: MatrixEvent) {