[Feat] Add Distortions's pdf/logpdf, unroll a few loops.

[lrnv]

Also add a benchmark file in the test folder that could be used for benchmarking, if the chairmarks stuff is sorted out in #314.

We need testing on these conditionals pdf and cdfs...

[codecov]

Codecov Report

❌ Patch coverage is 13.40580% with 239 lines in your changes missing coverage. Please review.
✅ Project coverage is 16.27%. Comparing base (c974872) to head (7d65da8).

Files with missing lines	Patch %	Lines
...eDistribution/Distortions/BivArchimaxDistortion.jl	0.00%	30 Missing ⚠️
src/Conditioning.jl	3.33%	29 Missing ⚠️
src/Copula.jl	0.00%	24 Missing ⚠️
src/Generator/GumbelGenerator.jl	0.00%	24 Missing ⚠️
src/ArchimedeanCopula.jl	22.22%	21 Missing ⚠️
...iateDistribution/Distortions/PlackettDistortion.jl	0.00%	19 Missing ⚠️
src/EllipticalCopula.jl	0.00%	18 Missing ⚠️
...ateDistribution/Distortions/HistogramDistortion.jl	0.00%	12 Missing ⚠️
...riateDistribution/Distortions/StudentDistortion.jl	0.00%	12 Missing ⚠️
src/SklarDist.jl	38.88%	11 Missing ⚠️
... and 12 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #341       +/-   ##
===========================================
- Coverage   77.95%   16.27%   -61.69%     
===========================================
  Files          84       84               
  Lines        4986     5181      +195     
===========================================
- Hits         3887      843     -3044     
- Misses       1099     4338     +3239     

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