Add somewhat disgusting hacks for datetime support

The can guess the dtype unit for almost anything that looks like
a string (including numpy strings). So they support looking
at every array element very well (in order to find the correct
dtype).
We thus need two hacks to support them:
1. Ensure that any string-like object is directly handled by
   the datetime (using is_known_scalar_type)
2. Have a string/bytes->datetime special case in the dtype from
   array discovery path which should only special case `object`
   arrays. (at least I would prefer that).

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