Revert "rename shap-related explainability to sklearn (#3103)"

[dennisbader]

This reverts commit 2b1b8a2.

Checklist before merging this PR:

• Mentioned all issues that this PR fixes or addresses.
• Summarized the updates of this PR under Summary.
• Added an entry under Unreleased in the Changelog.

Summary

Reverts "rename shap-related explainability to sklearn (#3103)" for new Darts patch release. We can re-apply the commit later on.

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.24%. Comparing base (36ea035) to head (0129ea1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3112      +/-   ##
==========================================
- Coverage   96.31%   96.24%   -0.07%     
==========================================
  Files         161      161              
  Lines       17356    17356              
==========================================
- Hits        16716    16705      -11     
- Misses        640      651      +11     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.