message: Small tweak to convert Date and Time objects to strings in Table viz.
  Currently, Date, Time_Of_Day and Date_Time are rendered as `[Object object]` in the table.
  ![image](https://user-images.githubusercontent.com/4699705/206166467-a08c8a78-af63-4b2e-93d7-4f4d4190f117.png)
  This makes them render in simple text format.
diff: @@ -175,7 +175,42 @@ class TableVisualization extends Visualization {
  result += '<th>' + content + '</th>'
  }
  function addCell(content) {
  - result += '<td class="plaintext">' + content + '</td>'
  + let to_render = content
  + if (content instanceof Object) {
  + const type = content.type
  + if (type === 'Date') {
  + to_render = new Date(content.year, content.month, content.day)
  + .toISOString()
  + .substring(0, 10)
  + } else if (type === 'Time_Of_Day') {
  + const js_date = new Date(
  + 0,
  + 0,
  + 0,
  + content.hour,
  + content.minute,
  + content.second,
  + content.nanosecond / 1000000
  + )
  + to_render =
  + js_date.toTimeString().substring(0, 8) +
  + (js_date.getMilliseconds() === 0 ? '' : '.' + js_date.getMilliseconds())
  + } else if (type === 'Date_Time') {
  + const js_date = new Date(
  + content.year,
  + content.month,
  + content.day,
  + content.hour,
  + content.minute,
  + content.second,
  + content.nanosecond / 1000000
  + )
  + to_render =
  + js_date.toISOString().substring(0, 19).replace('T', ' ') +
  + (js_date.getMilliseconds() === 0 ? '' : '.' + js_date.getMilliseconds())
  + }
  + }
  + result += '<td class="plaintext">' + to_render + '</td>'
  }
  result += '<tr>'
  parsedData.indices_header.forEach(addHeader)
  