Changes to Feature and Attribute

[zStupan]

Summary

• Changed Feature and Attribute to abstract types
• Added structs NumericalFeature, CategoricalFeature, which are subtypes of abstract type Feature.
• Added structs NumericalAttribute, CategoricalAttribute, which are subtypes of abstract type Attribute.
• NumericalFeature and NumericalAttribute are parametric structs that accept subtypes of Real (e. g. NumericalFeature{Int64}, NumericalFeature{Float32}, NumericalFeature{UInt8}, ...).
• Added methods isnumerical and iscategorical, to check if Attribute or Feature is numerical/categorical.
• Added dtype method which returns the parameter type for numerical feaures and attributes (e. g. dtype(NumericalFeature("distance", 1, 100)) # returns Int64), and String for categorical features and attributes.
• Updated the rest of the code and tests accordingly.

[codecov-commenter]

Codecov Report

Base: 45.77% // Head: 45.12% // Decreases project coverage by -0.64% ⚠️

Coverage data is based on head (58ae171) compared to base (a5a0128).
Patch coverage: 71.42% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
- Coverage   45.77%   45.12%   -0.65%     
==========================================
  Files          14       14              
  Lines         284      277       -7     
==========================================
- Hits          130      125       -5     
+ Misses        154      152       -2     

Impacted Files	Coverage Δ
src/NiaARM.jl	0.00% <ø> (ø)
src/attribute.jl	30.00% <22.22%> (+18.88%)	⬆️
src/feature.jl	50.00% <44.44%> (+35.71%)	⬆️
src/dataset.jl	100.00% <100.00%> (ø)
src/narm.jl	93.44% <100.00%> (-0.11%)	⬇️
src/rule.jl	50.00% <100.00%> (ø)

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