Feature/rev in reg mod

[authierj]

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.

Fixes #.

Summary

Other Information

[codecov]

Codecov Report

Attention: Patch coverage is 27.77778% with 13 lines in your changes missing coverage. Please review.

Project coverage is 94.08%. Comparing base (c52ec83) to head (d0f5b6a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
darts/models/forecasting/regression_model.py	27.27%	8 Missing ⚠️
darts/utils/data/tabularization.py	28.57%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2653      +/-   ##
==========================================
- Coverage   94.20%   94.08%   -0.13%     
==========================================
  Files         141      141              
  Lines       15491    15509      +18     
==========================================
- Hits        14594    14591       -3     
- Misses        897      918      +21     

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