Adds nx-cugraph benchmarks for 23.12 algos (SSSP, pagerank, hits, katz_centrality, degree_centrality, eigenvector_centrality)

[rlratzel]

closes rapidsai/graph_dl#404

• Adds benchmarks for algos added in the 23.12 release
  • SSSP
  • pagerank
  • hits
  • katz_centrality
  • degree_centrality
  • eigenvector_centrality
• Refactors fixtures for easier usage and mainentance
• uses benchmark.pedantic instead of benchmark to provide complete control over how to benchmark the algos, since benchmark will result in no fewer than 3 runs (calibrate timer, timed run, run to generate func return value) which can be too time consuming for slower runs.
• Removes code to create Dataset objects for larger datasets and replaces with the equivalent objects that are now part of cugraph.datasets

[rlratzel]

/merge