Support HTML5 canvas elements when cloning drag preview

[masaala]

Please describe the feature you would like to request.

Would be nice if default cdkDragPreview element would copy canvas elements too. Now one needs to handle copying process by their own and create custom cdkDragPreview elements to be shown in preview.

What is the use-case or motivation for this proposal?

For example drag drop list of charts.

Is there anything else we should know?

Here you can find simplified example to see canvas element disappearing from drag preview.
https://stackblitz.com/edit/angular-efx3ry

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