title: Chart.js v3 - is annotation supported in version 3?
body: <p>I have used 'annotation' inside options in version 2 chart, but after updating to version 3, it's not working neither I am able to find documentation regarding that. Below code was working in version 2.</p>
  <pre><code>options: {
   annotation: {
    annotations: [
     {
      drawTime: 'afterDraw',
      type: 'line',
      borderDash: [5],
      mode: 'horizontal',
      scaleID: 'y-axis-0',
      borderColor: '#2E74E5',
      borderWidth: 2,
     }]
    },
    ...
   }
  </code></pre>