Async select prop to clear loadedOptions (#6000)

[vinicius-frs]

AsyncSelect - Option to clear loadedOptions on new search (not cached) #6000
The prop being truthy, it clears the loadedOptions once a new search (not cached) is inputed, this way the loading is more clear to the user.

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[Greatshock]

Hi @JedWatson , can you please take a look at this one? Having the same issue here