[REVIEW] FEA SciPy sparse matrix input support for WCC, SCC, SSSP, and BFS #1277
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Added support for SciPy sparse matrix inputs to WCC, SCC, SSSP, and BFS. This PR also adds APIs which allow cugraph to be used as a drop-in replacement for the corresponding SciPy sparse graph routines here. This compatibility extends to adding new optional parameters which are handled based on the input type (Graph obj or matrix) and the specific algo.
Additional refactorings were done to utilities to make the various input/output checking more reusable and compact, as well as a utility to clean up how optional dependencies are imported.