More tests for sparse Jacobians and Hessians

[gdalle]

Tests

• Fix discrepancy in sparse_scenarios() definition (no x)
• Add sparse Scenarios for vec-to-vec, vec-to-mat, mat-to-vec, mat-to-mat, vec-to-num and mat-to-num functions
• Make sure that the Hessian is not constant and actually depends on the input, by using a third power

Extensions

• Work around Symbolics.sparsejacobian and Symbolics.sparsehessian accepting only vectors

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 2.27273% with 86 lines in your changes are missing coverage. Please review.

Project coverage is 91.79%. Comparing base (dfd6022) to head (e2aee6e).

Files	Patch %	Lines
...fferentiationInterfaceTest/src/scenarios/sparse.jl	0.00%	86 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #189      +/-   ##
==========================================
- Coverage   93.94%   91.79%   -2.16%     
==========================================
  Files          67       67              
  Lines        3287     3364      +77     
==========================================
  Hits         3088     3088              
- Misses        199      276      +77     

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