Fix/fix various issues

[hrzn]

• Fixes a recent issue with xarray 2022-06, which changed reset_index() behaviour (see Coordinate promotion workaround broken pydata/xarray#6607). We now re-build the DataArrays from scratch with proper coordinates instead of relying on reset_index().

• Fixes an issue due to the latest release of StatsForecast, which contained a breaking change, by fixing the version number.

• Small improvements to TimeSeries user guide.

[codecov-commenter]

Codecov Report

Merging #1106 (a695909) into master (caccce1) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1106      +/-   ##
==========================================
- Coverage   93.65%   93.64%   -0.02%     
==========================================
  Files          79       79              
  Lines        8137     8121      -16     
==========================================
- Hits         7621     7605      -16     
  Misses        516      516              

Impacted Files	Coverage Δ
darts/dataprocessing/dtw/dtw.py	94.20% <100.00%> (-0.13%)	⬇️
darts/timeseries.py	92.15% <0.00%> (-0.07%)	⬇️
...arts/models/forecasting/torch_forecasting_model.py	89.54% <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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[dennisbader]

Thanks a lot for fixing these issues! Looks good 👍