A small note on close event listeners

Currently all the event listeners that handle close are set to be handled at bubbling phase.
```js
if (state.visible) {
window.addEventListener('keydown', handleKeyboard);

for (const ev of hideOnEvents) window.addEventListener(ev, hide);
}
```

**Will there be any unintended consequences if we take the approach mentioned below?**
Change all the events to be handled during capture phase, this offers us the following advantages:
- scroll: the behavior gets inline with the browser's default context menu
- works with any scroll action (even when there is no scroll bar). This should fix #161.
- works even when scroll happens anywhere on the screen. Consider a two column layout where the right one has the context menu and the left one has a scroll. The menu will close when the scroll happens in the left column(browser's default context menu works like this).
- other events: there might be few elements on the screen which might do stopPropagation and prevent the context menu from closing. capturing the event fixes this issue.

Also adding a mousedown event would be helpful in cases where we have elements that are draggable.

I would be happy to work on this if you are okay with this.