feat: allow naming scenarios and test sets

[gdalle]

• Add a name kwarg to Scenario constructors
• Add a testset_name kwarg to test_differentiation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.96%. Comparing base (0ea7f1d) to head (614a70a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #712   +/-   ##
=======================================
  Coverage   97.96%   97.96%           
=======================================
  Files         119      119           
  Lines        6297     6302    +5     
=======================================
+ Hits         6169     6174    +5     
  Misses        128      128           

Flag	Coverage Δ
DI	98.92% <ø> (ø)
DIT	95.92% <100.00%> (+0.01%)	⬆️

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