Add Minimum Spanning Tree Capabilities

Currently, I extend several functions from `Graphs.jl` in [this file](https://github.com/zavalab/PlasmoData.jl/blob/main/src/functions.jl). However, I should add functionality for getting the [minimum spanning trees](https://juliagraphs.org/Graphs.jl/stable/algorithms/spanningtrees/) from `Graphs.jl`