[New] DayPickerSingleDateController: add allowUnselect prop option to allow unselecting dates
#2066
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Adds a new property in DayPickerSingleDateController which allows users to unselect a previously selected date by clicking on it.
This PR fixes #2061.
I'm tentatively increasing the minor version given that this PR effectively adds new functionality in a backward compatible way. I'm happy to simply increase the patch version as well, even though this is not necessarily a bug fix.
Alternative considered in the implementation:
I've also considered making this functionality enabled by default, however there would be the risk that it would break users who would not handle undefined (or eventually null) in the onDateChange callback.