Add unit tests for prepare_categorical_data

[premsrii]

This PR adds unit tests for the function prepare_categoriccal_data(). The function is also modified to handle only non-numerical data.

[chrislemke]

Looks good so far. Could you check if all unit tests pass on your machine? There seems to be an issue with the test on the CI and I just want to make sure everything runs. And please pull all changes from main before running the tests. Thanks!

[premsrii]

Looks good so far. Could you check if all unit tests pass on your machine? There seems to be an issue with the test on the CI and I just want to make sure everything runs. And please pull all changes from main before running the tests. Thanks!

All tests are passing now. I have modified other files because of changes in prepare_categorical_data().

[chrislemke]

@premsrii If you need help resolving the merge conflict. We could do it together.

[codecov]

Codecov Report

Merging #5 (646570d) into main (ed98f9a) will increase coverage by 0.50%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
+ Coverage   94.31%   94.82%   +0.50%     
==========================================
  Files           8        8              
  Lines         352      348       -4     
==========================================
- Hits          332      330       -2     
+ Misses         20       18       -2     

Impacted Files	Coverage Δ
feature_reviser/feature_selection/reviser.py	93.75% <100.00%> (ø)
feature_reviser/feature_selection/selector.py	90.47% <100.00%> (ø)
feature_reviser/utils.py	100.00% <100.00%> (+6.45%)	⬆️

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