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Add edge list methods to get edgelist from graph objects (#122)

* Add edge list methods to get edgelist from graph objects

This commit adds 2 new methods, edge_list() and weighted_edge_list(),
to the PyDiGraph (and PyDAG) and PyGraph classes for getting an edge
list from a graph object. They return a list of tuples that represent
all the edges in the graph.

* Fix python lint and tests

* Apply suggestions from code review

Co-authored-by: Lauren Capelluto <laurencapelluto@gmail.com>

* Fix rst formatting in graph.rs docstrings too

Co-authored-by: Lauren Capelluto <laurencapelluto@gmail.com>

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