[refactor] Separate categorical encoding as a method

[nabenabe0928]

Separate a process for the readability.

[codecov[bot]]

Codecov Report

Merging #404 (7e40b0a) into development (048656e) will decrease coverage by 0.26%. The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development     #404      +/-   ##
===============================================
- Coverage        84.15%   83.89%   -0.27%     
===============================================
  Files              175      175              
  Lines            10169    10172       +3     
  Branches          1747     1747              
===============================================
- Hits              8558     8534      -24     
- Misses            1112     1136      +24     
- Partials           499      502       +3     

Impacted Files	Coverage Δ
autoPyTorch/data/tabular_feature_validator.py	92.26% <100.00%> (+0.13%)	:arrow_up:
...eline/components/setup/optimizer/base_optimizer.py	80.95% <0.00%> (-19.05%)	:arrow_down:
...abular_preprocessing/base_tabular_preprocessing.py	66.66% <0.00%> (-13.34%)	:arrow_down:
...ne/components/setup/lr_scheduler/base_scheduler.py	93.10% <0.00%> (-6.90%)	:arrow_down:
...up/network_initializer/base_network_initializer.py	93.54% <0.00%> (-6.46%)	:arrow_down:
.../pipeline/components/setup/network/base_network.py	88.05% <0.00%> (-5.98%)	:arrow_down:
...nts/setup/early_preprocessor/EarlyPreprocessing.py	85.71% <0.00%> (-5.72%)	:arrow_down:
...re_preprocessing/SelectPercentileClassification.py	89.47% <0.00%> (-5.27%)	:arrow_down:
...nts/setup/network_backbone/ConvNetImageBackbone.py	96.15% <0.00%> (-3.85%)	:arrow_down:
...peline/components/training/trainer/MixUpTrainer.py	97.14% <0.00%> (-2.86%)	:arrow_down:
... and 3 more

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[nabenabe0928]

• test/test_api/test_base_api.py::test_pipeline_get_budget[3-50-runtime-expected1-classification_categorical_only]
• test/test_pipeline/test_tabular_regression.py::TestTabularRegression::test_pipeline_predict[regression_numerical_and_categorical]