Probabilisitic set

[pat-alt]

Added the abstract type necessary to add conformal classifiers for general use (see related issue). Nothing done yet with respect to downstream tasks. Decided to use only ProbabilisticSet for now, as I'm not sure the other case is necessary. Also added the trait definition.

[codecov-commenter]

Codecov Report

Merging #167 (7c2e2c4) into dev (100c477) will decrease coverage by 0.21%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev     #167      +/-   ##
==========================================
- Coverage   88.70%   88.48%   -0.22%     
==========================================
  Files           8        8              
  Lines         354      356       +2     
==========================================
+ Hits          314      315       +1     
- Misses         40       41       +1     

Impacted Files	Coverage Δ
src/MLJModelInterface.jl	100.00% <ø> (ø)
src/model_traits.jl	75.00% <0.00%> (-1.37%)	:arrow_down:
src/metadata_utils.jl	98.38% <0.00%> (+0.02%)	:arrow_up:

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[ablaom]

@pat-alt Perhaps you missed my suggestion above?

[pat-alt]

@pat-alt Perhaps you missed my suggestion above?

Indeed, I completely missed that, sorry! And thanks for doing, great to see this has now been merged. Thanks!