Add originalEvent property to NavigationControl events

[stepankuzmin]

This PR adds originalEvent property to events initiated using NavigationControl (zoom in, zoom out, reset bearing). Relates to #6405

[asheemmamoowala]

@stepankuzmin Thanks for this fix. Looks good , but could you also add a note in the docs to signal that the MouseEvent can be a click when the zoom is triggered by a UI event.

mapbox-gl-js/src/ui/events.js

Lines 216 to 219 in 506a3ef

	/**
	* @typedef {Object} MapBoxZoomEvent
	* @property {MouseEvent} originalEvent
	*/

[stepankuzmin]

@stepankuzmin Thanks for this fix. Looks good , but could you also add a note in the docs to signal that the MouseEvent can be a click when the zoom is triggered by a UI event.

@asheemmamoowala I've added a note for this

[mourner]

Also, could you please rebase on master? This might fail the build once merged because of stricter linting rules about curly braces.

[stepankuzmin]

@mourner done!