Animate updates to axes

### Feature Proposal

It would be very powerful for chart.js to include the possibility to animate the axes upon general calls to chart.update().

[This simple and powerful example from d3](https://bl.ocks.org/d3noob/7030f35b72de721622b8) shows how an axis animation can provide very useful context for how the scale changes, compared to just animating the datasets. Especially the Y-axis animation is helpful to grasp the scale of the update more easily:


(this was originally posted as https://github.com/chartjs/Chart.js/issues/4221#issuecomment-800513443, however it seems to have drowned there, therefore opening a separate request here)

### Possible Implementation

https://bl.ocks.org/d3noob/7030f35b72de721622b8