Expose `mouseDown` `mouseUp` `mouseMove` for users to manipulate

[hunkim98]

I am currently creating an iPad app using dotting. I found that there is a need to overlay the webview with a native view for Apple Pencil touch events. To do that, I must have to call mouseDown mouseUp mouseMove manually through events.

I show you my current progress

IMG_9432.MOV

As you can see, there is a need to distinguish Apple pencil touch and finger touch. This is why I need to expose the mouseDown mouseUp mouseMove functions