Centrality update

[nwlandry]

• Removed the ZEC_centrality because it doesn't converge and the paper by Austin Benson talks a bit about this
• Added tests for all centrality measures.
• Added additional tests for the xgi_data module.
• Added the ability for centrality to handle empty/invalid hypergraphs. Because these are Node/EdgeStats, I opted to return NaN when the centralities are invalid.

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Codecov Report

Patch coverage: 95.45% and project coverage change: +2.07 🎉

Comparison is base (7cc3b6b) 84.32% compared to head (803fa2a) 86.39%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #313      +/-   ##
==========================================
+ Coverage   84.32%   86.39%   +2.07%     
==========================================
  Files          35       35              
  Lines        2756     2757       +1     
==========================================
+ Hits         2324     2382      +58     
+ Misses        432      375      -57     

Impacted Files	Coverage Δ
xgi/classes/function.py	100.00% <ø> (ø)
xgi/classes/hypergraph.py	85.89% <ø> (ø)
xgi/classes/simplicialcomplex.py	83.73% <ø> (ø)
xgi/drawing/draw.py	24.01% <0.00%> (ø)
xgi/drawing/layout.py	100.00% <ø> (ø)
xgi/dynamics/synchronization.py	81.66% <ø> (ø)
xgi/linalg/matrix.py	94.24% <ø> (ø)
xgi/stats/nodestats.py	72.34% <ø> (+2.34%)	⬆️
xgi/algorithms/centrality.py	97.91% <100.00%> (+34.87%)	⬆️

... and 3 files with indirect coverage changes

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[maximelucas]

Genius. Thanks so much.

Very good call adding those tests for the loading too.
This PR fixes #310 and #311 and partially fixes #298.