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]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@            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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