[Feature] Large datapoints ( more than 500k) at a time in echarts heatmap

### What problem does this feature solve?

So, I'm trying to build a chart where we can show more than 500k data points as a heatmap in charts. Currently, we've had a "progressive" option which helps a little bit but when somebody wants to zoom in or zoom out then progressive things behave like animation and it's very annoying as a user.

Also, when hovering through data it lags a lot, which also adds up to bad user experience.

### What does the proposed API look like?

So, if there could be a method where maybe we can use "Webgl" renderer in heatmap or progressive doesn't feel like the animation to the user. That would be great.

Like we already have scattergl but we don't have the same for the heatmap.