title: Use input-groups in easy-admin 3
body: <p>I'm trying to use <a href="https://getbootstrap.com/docs/3.3/components/#input-groups-basic" rel="nofollow noreferrer">input-groups</a> in easy-admin3, as much as I search the net, I can't find any ideas?</p>
  <p>My question is if it is possible to add it by specifying the config from the <strong>configureFields</strong> method as the &quot;<strong>setFormTypeOption</strong>&quot; is used to specify certain properties and not have to create a file <strong>file.html.twig</strong> for this</p>
  <pre><code>      $emailFields = TextField::new('email')-&gt;setFormTypeOption(&quot;attr.maxlength&quot;, 100);
  
        if($pageName==Crud::PAGE_EDIT || $pageName==Crud::PAGE_NEW){
          $tagFields
            -&gt;setFormTypeOption(&quot;attr.class&quot;, 'check-field')
            -&gt;setFormTypeOption(&quot;attr.style&quot;, &quot;text-transform:uppercase&quot;)
  
            // something like that
            //-&gt;setFormTypeOption(&quot;attr.input-group&quot;, &quot;@example.com&quot;)
        }
  </code></pre>
  <p>To get something like that.
  <a href="https://i.stack.imgur.com/SlRIn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SlRIn.png" alt="enter image description here" /></a></p>