[Feature] a new Configuration for tooltip.trigger

[Acacia55]

What problem does this feature solve?

Currently, there are two levels of configuration for the tooltip.tragger configuration item, which are "item" and "axis". Now let's assume a scenario where we use a stacked column chart of groupings, with several bars in a group and stacked items on one bar. If you use Axis, the tooltip shows the stacked block information for all bars, and if you use Item, it can only display the stacked block information. Why can't we design a hierarchy that displays stacked block information on a column? (Of course, there is no problem with using axis, but it is not the best choice for stacked histograms with a large amount of data)

What does the proposed API look like?

a new Configuration for trigger