Return original class labels without encoding

[amit-sharma]

Fixes #369.

Only supported for sklearn models since pytorch/tf models cannot accept non-numeric labels.

[github-actions]

Unit Test Results

296 tests  +8   286 ✔️ +8   4m 58s ⏱️ -2s
    1 suites ±0     10 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 9513c76. ± Comparison against base commit 54d984a.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

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Files	Coverage Δ
dice_ml/explainer_interfaces/dice_genetic.py	93.35% <100.00%> (+0.04%)	⬆️
dice_ml/explainer_interfaces/dice_random.py	91.04% <100.00%> (+1.65%)	⬆️
dice_ml/explainer_interfaces/explainer_base.py	84.18% <100.00%> (+0.26%)	⬆️
dice_ml/utils/helpers.py	61.53% <100.00%> (+1.53%)	⬆️
dice_ml/explainer_interfaces/dice_KD.py	88.02% <91.66%> (-0.70%)	⬇️
dice_ml/diverse_counterfactuals.py	65.16% <66.66%> (+1.34%)	⬆️

... and 1 file with indirect coverage changes

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[gaugup]

thanks for the fix @amit-sharma. Merged.