Add df.etl.insert_columns

[GianlucaFicarelli]

Other: automatically shutdown the processes created by joblib and loky

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 85.63%. Comparing base (27969ea) to head (62b565d).

Files	Patch %	Lines
src/blueetl_core/parallel.py	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   85.55%   85.63%   +0.08%     
==========================================
  Files           6        6              
  Lines         360      369       +9     
  Branches       84       87       +3     
==========================================
+ Hits          308      316       +8     
  Misses         33       33              
- Partials       19       20       +1     

Flag	Coverage Δ
pytest	85.63% <90.90%> (+0.08%)	⬆️

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