ENH: umath: Make sum, prod, any, or functions use the .reduce method directly

This required some extensive changes, like:
 * Making logical_or, logical_and, and logical_not on object arrays behave
   like their Python equivalents instead of calling methods on the objects
 * Changing the units for a fair number of the binary operations to
   None, so they don't get initialized to their unit values at the start

A consequence of this is that multi-dimensional reductions like sum, prod,
any, or all no longer need to make copies, so are faster in some cases.

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