title: Disabling pinch zoom in Flutter team's webview
body: <p>Hi does flutter team's webview plugin have a function to disable pinch zoom in iOS? In the community plugin, its <code>withZoom</code> but I don't know how to do it in Flutter team's webview. Or is there a equivalent function to do it in the team's plugin ?</p>
  
  <p>I have reasons why I want to use the official webview plugin.</p>
  
  <p>Kindly help. Thanks.</p>