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Added delegate for webTransport which can handle connection/reconnection/disconnection events of websocket.
Why need it:
If you have subscriptions, and websocket reconnected for some reason (when app in background or internet connection is weak), eventually you want to handle it and retrieve missed data which could appear on backend when your websocket connection (-> all subscriptions) was down.
Done in a similar way with JS version of Apollo (with callbacks for SubscriptionClient)