Add a function for ordering edge data

[dlcole3]

When passing edge data to a GNNGraph (see GraphNeuralNetworks.jl), the edge data is assumed to be ordered based off the SimpleGraph fadjlist (i.e., it starts at node 1, adds connections, goes to node 2, adds connections, etc). However, the DataGraph edgedata is not required to follow this order. Some function needs to be done or the data structure needs to be restructured to allow for this order to be followed.