Allow to access fx from jac_cache via public API

[j-fu]

No description provided.

[codecov-commenter]

Codecov Report

Base: 81.44% // Head: 0.22% // Decreases project coverage by -81.21% ⚠️

Coverage data is based on head (023c741) compared to base (7f00964).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #210       +/-   ##
==========================================
- Coverage   81.44%   0.22%   -81.22%     
==========================================
  Files          15      15               
  Lines         900     887       -13     
==========================================
- Hits          733       2      -731     
- Misses        167     885      +718     

Impacted Files	Coverage Δ
src/SparseDiffTools.jl	40.00% <ø> (-60.00%)	⬇️
src/differentiation/compute_jacobian_ad.jl	0.00% <0.00%> (-90.46%)	⬇️
src/coloring/high_level.jl	0.00% <0.00%> (-100.00%)	⬇️
src/coloring/matrix2graph.jl	0.00% <0.00%> (-100.00%)	⬇️
src/coloring/greedy_d1_coloring.jl	0.00% <0.00%> (-100.00%)	⬇️
src/coloring/contraction_coloring.jl	0.00% <0.00%> (-100.00%)	⬇️
src/coloring/greedy_star1_coloring.jl	0.00% <0.00%> (-100.00%)	⬇️
src/coloring/greedy_star2_coloring.jl	0.00% <0.00%> (-100.00%)	⬇️
src/differentiation/compute_hessian_ad.jl	0.00% <0.00%> (-100.00%)	⬇️
src/differentiation/jaches_products_zygote.jl	0.00% <0.00%> (-100.00%)	⬇️
... and 4 more

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[j-fu]

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