TYP: Fix false rejection of NDArray[object_].__abs__()
#28705
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Backport of #28699.
partial port of numpy/numtype#508
Static type-checkers currently reject
abs(np.array([1], np.object_)), even though it is a valid runtime expression. This adds an__abs__method tonp.object_, indirectly causing type-checkers to accept calls toNDArray[object_].__abs__as well.