title: Set datapath for tree data ag grid
body: <p>I have a data like below</p>
  <p><code>let data = [{id: 1,name: 'x', children: [{name:'y', id:2}, {name:'c', id: 3}]}]</code></p>
  <p>I want to display tree data with client side row model</p>
  <p>how to set getdata path and display parent row with name x and child rows with name y and c?</p>