Megaissue: improvements to WebSockets

[bignimbus]

Tasks

Beta Give feedback

1. Subscription switched to DISCONNECTED #2765
   🐛 Type: Bug 📲 Subscriptions +2
2. SubscriptionHeartbeat no "pong" message in sealed class OperationClientMessage #3020
   ❓ Type: Question +1
3. Add a way to get info about the websocket connexion status #4652
   📲 Subscriptions 🚗 Runtime ✨ Type: Feature 📜 Feedback Wanted +4
   
4. Retrying a subscription does not renew the id and may cause an error on the server because the id is already used #5217
   🐛 Type: Bug +1
   

[martinbonnin]

Closing as WebSocketNetworkTransport is shipped as part of 4.0.0-beta.6.
See #5862 for follow ups.

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