call onScroll event on failed attempt to scroll down

[rahulakrishna]

Changes

• Add a listener on wheel events
• detect the wheel direction and for cases with no scroll bar, call the onScroll event

How to Test

src/stories/WindowInfiniteScrollComponent.tsx, change the Array length to a lower number.

Resolves: loader doesn't appear when page is bigger than InfiniteScroll #345

[rahulakrishna]

@ankeetmaini can we merge this?

[pablomikel]

+1 encountering this issue as well and this would be a welcome fix