kronecker product cache

[wupeifan]

ID	time ratio	memory ratio
["fvgq", "fvgq", "second_order_no_cache"]	0.92 (5%) :white_check_mark:	1.00 (1%)
["fvgq", "fvgq", "second_order_p"]	0.92 (5%) :white_check_mark:	0.81 (1%) :white_check_mark:
["rbc", "rbc_observables", "first_order_solver_cache"]	1.02 (5%)	0.98 (1%) :white_check_mark:
["rbc", "rbc_observables", "second_order_p"]	1.00 (5%)	0.96 (1%) :white_check_mark:
["sgu", "sgu", "first_order_solver_cache"]	0.99 (5%)	0.98 (1%) :white_check_mark:
["sgu", "sgu", "second_order_p"]	0.99 (5%)	0.96 (1%) :white_check_mark:
["utilities", "vech"]	1.08 (5%) :x:	1.00 (1%)

[codecov[bot]]

Codecov Report

Merging #83 (43248c7) into main (96c5cba) will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
+ Coverage   79.48%   79.55%   +0.07%     
==========================================
  Files          12       12              
  Lines        1131     1135       +4     
==========================================
+ Hits          899      903       +4     
  Misses        232      232              

Impacted Files	Coverage Δ
src/types.jl	91.89% <ø> (ø)
src/generate_perturbation_derivatives.jl	91.84% <100.00%> (+0.11%)	:arrow_up:

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[wupeifan]

ready.