Test line graph

[nwlandry]

• changed the name from convert_to_line_graph to to_line_graph.
• added s-parameter like in "Hypernetwork science via high-order hypergraph walks"
• added tests

Fixes #298.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.04 ⚠️

Comparison is base (e085434) 90.26% compared to head (d854532) 90.22%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
- Coverage   90.26%   90.22%   -0.04%     
==========================================
  Files          35       35              
  Lines        2814     2813       -1     
==========================================
- Hits         2540     2538       -2     
- Misses        274      275       +1     

Impacted Files	Coverage Δ
xgi/algorithms/centrality.py	97.91% <100.00%> (ø)
xgi/convert.py	95.63% <100.00%> (-0.03%)	⬇️

... and 1 file with indirect coverage changes

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[maximelucas]

Great work Nich!!