[Tracking] Updating dependencies to CategoricalArrays 1.0

[ablaom]

CategoricalArrays 1.0 breaks a few things in MLJ. See here for some details. Here's the rough sequence for rolling these out:

• Update CategoricalDistributions.jl and tag as breaking, v0.2.0
• Update ScientificTypes.jl
• Update StatisticalMeasures.jl
• Update MLJBase.jl

I will do these.

Then, in no particular order, we should review the compat requirements for the following core packages. I do not expect breakages but in a few cases we might start getting dep warnings which would be good to address these early.

• MLJTuning.jl Does not appear to need updating (tested with a draft MLJBase update)
• MLJIteration.jl ditto
• MLJEnsembles.jl Bump compats: CategoricalArrays="1.0", CategoricalDistributions="0.2" MLJEnsembles.jl#42
• MLJTransforms (needed for testing in MLJModels) Bump [compat] entry: CategoricalArrays="1.0" MLJTransforms.jl#61
• MLJMultivariateStatistics (needed for MLJModels testing) Bump compats for StatsBase and CategoricalDistributions MLJMultivariateStatsInterface.jl#63
• MLJDecisionTreeInterface.jl (needed for tests in FeatureSelection.jl and MLJModels.jl) Bump CategoricalArrays compat to 1.0 MLJDecisionTreeInterface.jl#60
• MLJModels.jl (needed for tests in MLJBalancing) Bump compat CategoricalArrays="1" MLJModels.jl#597
• Imbalance.jl (needed for testing MLJBalancing)
• MLJBalancing.jl (doesn't appear to need code changes, but depends on MLJBase)
• FeatureSelection.jl Extend compat for StatisticalMeasures to include v0.3 FeatureSelection.jl#30
• SIRUS.jl

And then, some packages providing implementations of the MLJ API may need updating.

Here are some I've checked and don't appear to need attention:

• MLJScikitLearnInterface

cc @DilumAluthge @devmotion