title: How can I make a "show up" text animation in Flutter?
body: <p>I want to achieve the kind of behavior shown in the material.io page: </p>
  
  <p><a href="https://i.stack.imgur.com/nkB3v.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/nkB3v.gif" alt="enter image description here"></a></p>
  
  <p>The text does a nice transition when is being shown for the first time.</p>
  
  <p>How can I do that in Flutter?</p>