remove logger.setLevel()

[brunnedu]

Summary

• no usage of logger.setLevel in darts.logging.get_logger anymore
• users can use logging.basicConfig() before importing darts models to decide whether they want the model warning logs

[codecov-commenter]

Codecov Report

Merging #1034 (c31fc26) into master (321fade) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1034      +/-   ##
==========================================
- Coverage   91.32%   91.30%   -0.02%     
==========================================
  Files          77       77              
  Lines        7871     7856      -15     
==========================================
- Hits         7188     7173      -15     
  Misses        683      683              

Impacted Files	Coverage Δ
darts/logging.py	75.92% <ø> (-0.44%)	⬇️
darts/models/__init__.py	86.04% <0.00%> (-0.32%)	⬇️
darts/timeseries.py	91.99% <0.00%> (-0.07%)	⬇️
...arts/models/forecasting/torch_forecasting_model.py	89.51% <0.00%> (-0.05%)	⬇️
darts/models/forecasting/block_rnn_model.py	98.14% <0.00%> (-0.04%)	⬇️
darts/models/forecasting/nhits.py	99.25% <0.00%> (-0.01%)	⬇️
darts/datasets/__init__.py	100.00% <0.00%> (ø)

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