`LocalDevice.push.state` and `DeviceDetails.push.state` is always null

[ben-xD]

This is an issue because underlying packages (ably-cocoa and ably-java) do not use the state returned by the Ably servers (bugs https://github.com/ably/ably-cocoa/issues/1162 and https://github.com/ably/ably-java/issues/697). Once this is fixed, ably-flutter will update the versions of these dependencies to pass the bug fixes to ably-flutter users.

┆Issue is synchronized with this Jira Bug by Unito

[ikurek]

This seems to be blocked by https://github.com/ably/specification/issues/25