Add touch event listener to combo #3361

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

In the examples I have noticed that if I try to drag combos in mobile simulator, the nested comboTree doesn't follow. I need to make my client mobile friendly, so basically replicate the same mouse behaviour but for touch.

What does the proposed API look like?

I have seen that for nodes, you wrapped onTouchStart --> onDragStart onTouchMove --> onDrag

Would it be enough to do the same for combos?

<img width="1252" alt="Screenshot 2021-12-11 at 13 31 01" src="https://user-images.githubusercontent.com/26749313/145676635-bbe10a74-9d86-481b-b812-2187ac4ac349.png">

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