Support for click events?

[Miguel Lorenzo]

Hello, we are using this library in hopes to make an interactive graph. Is there support for click events? Seems like this isn't covered much in the docs aside from a note about `identify()`. The video examples about `identify()` that no longer exist.

https://yulab-smu.top/treedata-book/chapter12.html#identify

[Miguel Lorenzo]

To clarify, I'd love to know if click events are supported for something like a circular phylo tree with a heatmap (like below):

[Miguel Lorenzo]

Hello, just wanted to follow up on this. 

Otherwise we will have to use a different library for the graph if click events are not supported.