Added a higher-order base class

[nwlandry]

This PR does the following:

• Adds a HigherOrderNetwork base class for all classes to inherit from. Currently implements a constructor and some basic functionality.
• Now Hypergraph, SimplicialComplex, and DiHypergraph all inherit from HigherOrderNetwork. SimplicialComplex now no longer inherits from Hypergraph.
• Methods with warnings (e.g., add_edge) in SimplicialComplex have been removed.
• Renames the following. These are NOT breaking changes as they are all internal to XGI:
  • Renames _hypergraph to _net_attr
  • Renames _hypergraph_attr_dict_factory to _net_attr_dict_factory
  • Renames _hyperedge_dict_factory to _edge_dict_factory
• Up-versions pylint.

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.67%. Comparing base (6e5c25b) to head (6bfd5da).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #555 +/- ## ========================================== + Coverage 92.55% 92.67% +0.11% ========================================== Files 59 60 +1 Lines 4394 4274 -120 ========================================== - Hits 4067 3961 -106 + Misses 327 313 -14 ```

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