Augment the User model with GitHub ID and ORCID iD

[jvendetti]

This pull request adds githubId and orcidId attributes to the User model, enabling users to associate their GitHub and ORCID iDs. Resolves #160.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.84%. Comparing base (a3f6cf0) to head (a192308).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #201      +/-   ##
===========================================
+ Coverage    77.80%   77.84%   +0.04%     
===========================================
  Files           74       74              
  Lines         5275     5277       +2     
===========================================
+ Hits          4104     4108       +4     
+ Misses        1171     1169       -2     

Flag	Coverage Δ
unittests	77.84% <100.00%> (+0.04%)	⬆️

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