Show meaningful error view when response type is not swiftui

[bcardarella]

If someone forgets to add use MyAppNative, :live_view to their LiveView the application will respond with a html response. We currently just spin in this event. We cannot capture this issue on the server because our code isn't added at all to the LiveView but we can capture this on the client to provide a meaningful explanation of what is happening and push the developer in the correct direction.

/cc @dbii

[bcardarella]

We should handle this in Core where if the response content-type from the server doesn't match the client's content-type request it will provide a meaningful error.