Add a roundtrip cast for datetimes #79
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For the string to datetime cast I made it so it errors if you do e.g. string_array.astype('datetime64'), forcing the user to specify a unit. I don't think there's a way to give a more useful answer without guessing about the unit or doing value-based promotion.
I also had to update the includes to target the Numpy 2.0 C API and cleaned up some unneeded includes and usage of private numpy macros as well.