Add attribute to access differentiation time

[blegat]

No description provided.

[codecov]

Codecov Report

Base: 86.34% // Head: 86.19% // Decreases project coverage by -0.15% ⚠️

Coverage data is based on head (27d43a2) compared to base (f59762b).
Patch coverage: 95.34% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #230      +/-   ##
==========================================
- Coverage   86.34%   86.19%   -0.15%     
==========================================
  Files          11       11              
  Lines         908      920      +12     
==========================================
+ Hits          784      793       +9     
- Misses        124      127       +3     

Impacted Files	Coverage Δ
src/diff_opt.jl	98.47% <33.33%> (-1.53%)	⬇️
src/moi_wrapper.jl	85.00% <75.00%> (+0.05%)	⬆️
src/ConicProgram/ConicProgram.jl	93.61% <95.45%> (-0.55%)	⬇️
src/QuadraticProgram/QuadraticProgram.jl	98.02% <100.00%> (+0.05%)	⬆️

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