Support sparse array

[yasirroni]

Hi, I'm a matpower-pip maintainer. It currently fully support MATPOWER via octave and Oct2Py. I just got access to genuine MATLAB engine and test my package on it. Turns out, you didn't support sparse data.

TypeError: conversion of MATLAB sparse array to Python not supported

I suggest that you use scipy representation to support sparse: https://docs.scipy.org/doc/scipy/reference/sparse.html

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Hopefully, we can do at least this in Python

from matpower import start_instance

m = start_instance(engine="matlab")
m.runpf()