title: Implement DatePicker in an editable cell using ag-grid
body: <p>I'm using ag-Grid in my project. I need to get an editable cell with a datepicker. For reference, I have provided code that I implemented for drop-down. Can anyone help me to convert this element to DatePicker?</p>
  
  <pre><code>var columndefs = [      
       { field: 'expires', headerName: 'Expiry Date', width: 150, editable: true, cellEditor: dropdownCellEditor, cellEditorParams: celleditorparams}
  ];
  </code></pre>