`numpy.isin` is equivalent to `pandas.{Series,DataFrame}.isin`. Adding 
`numpy.ndarray.isin` would produce consistency with `pandas` and save 4 
characters (`np.isin(x, y)` vs. `x.isin(y)`).

I'm adding this idea here in conjunction with filing 
https://github.com/numpy/numpy/issues/20092 per the instructions.
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