add the composed property to events (closes #4739 in TestCafe)

[AlexKamaev]

This is the fix for https://github.com/DevExpress/testcafe/issues/4739

The click event should propaganate throught shadowDom boundaries, but it does not, since we do not mark our events as composed .

Here is the explanation from MDN:

The read-only composed property of the Event interface returns a Boolean which indicates whether or not the event will propagate across the shadow DOM boundary into the standard DOM.

https://developer.mozilla.org/en-US/docs/Web/API/Event/composed

I prepared the list of composed events from the specs:
https://www.w3.org/TR/uievents/

I cheched all events from the list, that they really bubbles through the shadowDom

[testcafe-build-bot]

✅ Tests for the commit 9f601f3 have passed. See details.

[testcafe-build-bot]

✅ Tests for the commit 3f5718d have passed. See details.