coalesce_messages support

This appears as a socket frame that appears immediately after Home Assistant replies with `auth_ok`.

```json
{"type":"supported_features","id":1,"features":{"coalesce_messages":1}}
```

It appears alter the way Home Assistant sends updates over the websocket. With this enabled, messages can appear as both single objects, or an array of objects. Objects appear to be patch changes, rather than full size entity states being sent with every update.

Example update

```json
{"id":3,"type":"event","event":{"c":{"sensor.adguard_home_dns_queries":{"+":{"s":"1171995","lc":1669568008.42719,"c":"01GJX0447BF912599CZBXNY4AX"}}}}}
```

Start by inspecting the existing TypeScript WebSocket bindings and how the auth_ok response is handled. Trace the supported_features frame and event updates, then verify that both single objects and arrays of patch changes are handled as intended.

Written by the indexing model from the issue text.