Significant update to model registry

[ablaom]

• (new models) Add CatBoost.jl to the model regsitry, which provides these new models: CatBoostRegressor and CatBoostClassifier.
• (new models) Update the registry to reflect addition of these models to OutlierDetectionPython.jl 0.2.1: INNEDetector, ECODDetector, KDEDetector, GMMDetector.
• Update the registry to reflect a change in the package_name trait for all MLJScikitLearnInterface.jl models, from "ScikitLearn" to "MLJScikitLearnInterface" (ScikitLearn.jl is not a dependency of MLJScikitLearnInterface.jl v0.4.0.)
• (docs) Update the registry to reflect new and improved dcostrings for NearestNeighborModels.jl.

@tylerjthomas9 @davnn @OkonSamuel

[codecov-commenter]

Codecov Report

Merging #507 (0e78b95) into dev (048d0ed) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##              dev     #507   +/-   ##
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  Coverage   76.96%   76.96%           
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  Files          16       16           
  Lines        1155     1155           
=======================================
  Hits          889      889           
  Misses        266      266           

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