title: How to make an IconPicker, a Widget to list icons for the user to pick
body: <p>I'd like to use an IconPicker where the user can search for an Icon and select it.
  If I search for "arrow" it would give me: arrow_upward, arrow_back, arrow_back_ios and so on.
  Can you link me a library that can do this? or give an idea of how I can accomplish that?</p>
  
  <p>I've looked everywhere, the only one I could find it was this: <a href="https://pub.dev/packages/flutter_picker" rel="nofollow noreferrer">https://pub.dev/packages/flutter_picker</a>.
  But it doesn't have the search option.</p>