Clickable notification title when click.url is set

[DVDAndroid]

Is your feature request related to a problem? Please describe. If I send a notification with this extra set:

{
  "extras": {
    "client::notification": {
      "click": { "url": "https://gotify.net" }
    }
  }
}

the url parameter is only available on the Android app (only when the notification is pressed, then its value is lost, I may implement this on the Android side, too)

Describe the solution you'd like Make (at least) the notification title clickable with the extra parameter in the JSON payload

Describe alternatives you've considered Leave as it is

Additional context I can send a PR