I8 return errors as warnings

[hillalex]

If the spline model for a disaggregated trace fails, don't throw an error but just return a warning for that trace. Closes #8

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.90%. Comparing base (bba41d9) to head (3758726).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   92.70%   92.90%   +0.20%     
==========================================
  Files           4        4              
  Lines         274      282       +8     
==========================================
+ Hits          254      262       +8     
  Misses         20       20              

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