deprecate concatenate_networks standalone function in favor of class methods

[atravitz]

I believe this helper method doesn't actually add any additional functionality, and should be removed.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.32%. Comparing base (2dbeb3a) to head (f2feabd).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #208      +/-   ##
==========================================
+ Coverage   92.24%   92.32%   +0.08%     
==========================================
  Files          84       84              
  Lines        2618     2633      +15     
==========================================
+ Hits         2415     2431      +16     
+ Misses        203      202       -1     

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[mikemhenry]

LGTM! I couldn't even find reference to the use in indy b-mark repo

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