coalesce_messages support

[zoe-codez]

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

{"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

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