Extend UIGP to multiple uncertain parameters (with different input variances)

[ziatdinovmax]

Addresses #70

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d02ffd5) 95.63% compared to head (1c945cb) 95.62%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
- Coverage   95.63%   95.62%   -0.02%     
==========================================
  Files          51       51              
  Lines        3918     3930      +12     
==========================================
+ Hits         3747     3758      +11     
- Misses        171      172       +1     

Flag	Coverage Δ
unittests	95.62% <100.00%> (-0.02%)	⬇️

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