Feat/statsforecasts ets

[hrzn]

• Update Croston and StatsForecastAutoARIMA to make it work with latest versions of statsforecast
• Add new model StatsForecastETS containing ETS
• Updated docs, added examples
• Bumped statsforecast version

[codecov-commenter]

Codecov Report

Merging #1171 (9a09fe0) into master (f953005) will decrease coverage by 0.11%.
The diff coverage is 63.04%.

@@            Coverage Diff             @@
##           master    #1171      +/-   ##
==========================================
- Coverage   93.65%   93.54%   -0.12%     
==========================================
  Files          80       81       +1     
  Lines        8295     8302       +7     
==========================================
- Hits         7769     7766       -3     
- Misses        526      536      +10     

Impacted Files	Coverage Δ
darts/models/forecasting/exponential_smoothing.py	100.00% <ø> (ø)
darts/models/forecasting/sf_ets.py	48.14% <48.14%> (ø)
darts/models/forecasting/sf_auto_arima.py	91.17% <66.66%> (ø)
darts/models/forecasting/croston.py	92.50% <86.66%> (+7.08%)	⬆️
darts/models/__init__.py	89.74% <100.00%> (+0.26%)	⬆️
darts/timeseries.py	92.23% <0.00%> (-0.07%)	⬇️
...arts/models/forecasting/torch_forecasting_model.py	87.45% <0.00%> (-0.05%)	⬇️
darts/models/forecasting/block_rnn_model.py	98.24% <0.00%> (-0.04%)	⬇️
darts/models/forecasting/nhits.py	98.55% <0.00%> (-0.02%)	⬇️
darts/datasets/__init__.py	100.00% <0.00%> (ø)

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[dumjax]

nice add, I don't see any problem