title: XF: Equivalent to Page OnAppearing event when app is resumed
body: <p>When App is resumed, XF calls OnAppearing on the Page. </p>
  
  <p>Is there something equivalent to this in Prism?
  I am expecting some interface, something similar to <code>INavigatedAware</code></p>
  
  <p>How can I know in the view-model that app was resumed and the view-model is for the current Page?</p>