chore(types): fill out remaining partial types. <!-- Thank you for contributing to Pyodide! All improvements are welcome,
     so don't be afraid to make a PR. -->

### Description

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Filling out remaining partially typed functions. Had to guess on a few, maybe some Any's could be avoided.

# http://stackoverflow.com/questions/16541618/perform-a-reverse-cumulative-sum-on-a-numpy-array
# pythran export reverse_cumsum(float[])
# setup: import numpy as np ; r = np.random.rand(1000000)
# run: reverse_cumsum(r)
import numpy as np


def reverse_cumsum(x):
    return np.cumsum(x[::-1])[::-1]

# http://stackoverflow.com/questions/16541618/perform-a-reverse-cumulative-sum-on-a-numpy-array
# pythran export reverse_cumsum(float[])
# setup: import numpy as np ; r = np.random.rand(1000000)
# run: reverse_cumsum(r)
import numpy as np


def reverse_cumsum(x):
    return np.cumsum(x[::-1])[::-1]
