Add mouse*, drag* and touch* events to Window and Document events stream helper extensions

[fsw]

According to MDN mouse* and drag* events bubble up to Document and Window:

https://developer.mozilla.org/en-US/docs/Web/API/Window#bubbled_events
https://developer.mozilla.org/en-US/docs/Web/API/Document#bubbled_events

Also code like this was working with dart:html:

document.onMouseMove.listen(handler);
document.onDragEnd.listen(handler);

I am not sure about the touch* events. MDN does not list those events for Document and Window but on the other hand they do bubble (at least in Firefox 145.0.* and Chrome 142.0.*). Also onTouchMove was already added in WindowEventGetters and those events were also working with dart:html. So maybe those should be added but to WindowCustomEvents and DocumentCustomEvents extensions instead?

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• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

[kevmoo]

Thoughts @srujzs

At a minimum @fsw we'll want a changelog entry here!