title: How to "lazy load" tab navigator screens now that lazy has been removed from react-navigation
body: <p>The maintainers of react-navigation have removed 'lazy: true' from the library, causing all tabs to attempt to render at once (and fetches previously controlled by lazy now firing out of order).</p>
  
  <p>In order to maintain similar functionality, how do you force a wait on a tab screen to not load or call fetch calls prior to being focused for the first time?</p>