Make the table sortable: clicks on <th> elements should sort it by corresponding column.

Each <th> has the type in the attribute, like this:

<table id="grid">
  <thead>
    <tr>
      <th data-type="number">Age</th>
      <th data-type="string">Name</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>5</td>
      <td>John</td>
    </tr>
    <tr>
      <td>10</td>
      <td>Ann</td>
    </tr>
    ...
  </tbody>
</table>

In the example above the first column has numbers, and the second one – strings. The sorting function should handle sort according to the type.

Only "string" and "number" types should be supported.

The working example:

P.S. The table can be big, with any number of rows and columns.

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