Sort ligand network edges by SMC inchikey

[jthorton]

Fixes #463 by sorting the order LigandNetwork edges are added to the networkx graph by the small molecule fixed hydrogen layer inchikey.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.52%. Comparing base (17fb08c) to head (b127ac8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #467   +/-   ##
=======================================
  Coverage   98.52%   98.52%           
=======================================
  Files          39       39           
  Lines        2174     2175    +1     
=======================================
+ Hits         2142     2143    +1     
  Misses         32       32           

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[jthorton]

pre-commit.ci autofix

[IAlibay]

lgtm, just the one thing about an extra comment and raising an issue.

[atravitz]

lgtm!