When table is hidden, move it to the canvas and show it, for accessibility purpose

ChartJS generates canva elements, this raises accessible issues when the data used for generating the chart is hidden. A way to address them is to include data within the canva elements that can be read by screen readers, as described on http://pauljadam.com/demos/canvas.html.

In TableToChartJS, the idea would be to move the table element to its corresponding canva element, typically when it's actually set as hidden.