Implement the (improved) Logisticsoftmax likelihood and its augmentation

[theogf]

• Adds the NegativeMultinomial distribution
• Adds the PolyaGammaNegativeMultinomial distribution
• Adds methods for the CategoricalLikelihood both with and without the bijective simplex link
• Make an example
• Adapt the tests for this multi-latent situation

[codecov[bot]]

Codecov Report

Merging #50 (aa430e5) into main (b18e42b) will decrease coverage by 21.69%. The diff coverage is 25.61%.

:exclamation: Current head aa430e5 differs from pull request most recent head c1a8836. Consider uploading reports for the commit c1a8836 to get more accurate results

@@             Coverage Diff             @@
##             main      #50       +/-   ##
===========================================
- Coverage   95.97%   74.28%   -21.70%     
===========================================
  Files          13       16        +3     
  Lines         497      665      +168     
===========================================
+ Hits          477      494       +17     
- Misses         20      171      +151     

Impacted Files	Coverage Δ
src/SpecialDistributions/SpecialDistributions.jl	60.00% <ø> (ø)
src/SpecialDistributions/negativemultinomial.jl	0.00% <0.00%> (ø)
...cialDistributions/polyagammanegativemultinomial.jl	0.00% <0.00%> (ø)
src/likelihoods/categorical.jl	1.44% <1.44%> (ø)
src/utils.jl	63.63% <20.00%> (-36.37%)	:arrow_down:
src/TestUtils.jl	82.53% <70.96%> (-13.16%)	:arrow_down:
src/SpecialDistributions/polyagamma.jl	91.73% <100.00%> (ø)
src/SpecialDistributions/polyagammapoisson.jl	100.00% <100.00%> (ø)
src/api.jl	100.00% <100.00%> (ø)
src/likelihoods/negativebinomial.jl	100.00% <100.00%> (ø)
... and 1 more

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