[Feature Request] More powerful `power` like `numpy.power`

[duskmoon314]

#1042 has added element-wise power methods powi and powf. But they only accept one parameter.

In NumPy, numpy.power receives two arrays, x1 and x2. The latter could be a number or an array and performs power with different exponents.

An example from: https://numpy.org/doc/stable/reference/generated/numpy.power.html#numpy.power

x1 = np.arange(6)
x2 = [1.0, 2.0, 3.0, 3.0, 2.0, 1.0]
np.power(x1, x2)
# array([  0.,   1.,   8.,  27.,  16.,   5.])

Though we may archive this using an iterator, a more powerful function might fill the gap for users coming from NumPy.