title: ag-grid : Clickable link in group cell rendered
body: <p>I am trying to make clicable link in group (group and its child should be clickable, should be like a link)</p>
  
  <p>i'm not able to make it because for a clickable link i need to create a cellrenderer but in this case group cellredered in already there</p>
  
  <pre><code>here is my plunker
  
  https://plnkr.co/edit/gMfQXY?p=preview
  </code></pre>