Fix scrollbar issue not triggering onMenuScrollToBottom

[cmeiller]

First of all, thank you for creating react-select!

Fixes #3232 & #5957
Superseed #4970

I fixed the #4970 PR from @Duarte10 to allow onMenuScrollToBottom function to be triggered using scrollbar with mouse dragged.

To fix the issue, we use a scroll listener, which requires changing the callback type from a WheelEvent to Event (which contains all WheelEvent, TouchEvent and UIEvent).

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react-codesandboxer-example	Issue #3232

[jacobsickels]

We are waiting on this merge!

[jacobsickels]

Pinging this again, it would be great to get this merged!