feat: deduplicate interconnect passed to grid constructor

[jenhagg]

Purpose

Improve experience of using the grid object by allowing users to provide interconnects as a set, and removing duplicates if a list is provided. Basically, eliminating the requirement of calling code to do Grid(list(set(interconnect))).

What the code is doing

Described above, and some test updates. Also, include tests in code coverage report.

Testing

There are good unit tests already, just modified as needed.

Usage Example/Visuals

In [1]: from powersimdata import Grid

In [2]: Grid({'Eastern', 'Texas'})
Reading bus.csv
Reading plant.csv
Reading gencost.csv
Reading branch.csv
Reading dcline.csv
Reading sub.csv
Reading bus2sub.csv
Reading zone.csv
Out[2]: <powersimdata.input.grid.Grid at 0x10f376cd0>

In [3]: Grid(['Texas', 'Texas'])
Reading bus.csv
Reading plant.csv
Reading gencost.csv
Reading branch.csv
Reading dcline.csv
Reading sub.csv
Reading bus2sub.csv
Reading zone.csv
Out[3]: <powersimdata.input.grid.Grid at 0x10f376df0>

In [4]: grid = _

In [5]: grid.interconnect
Out[5]: ['Texas']

Time estimate

10 min

[BainanXia]

Make sense. Thanks for taking care of the tests.

[danielolsen]

Thanks