Added compliance with multiple river features

[lucasczz]

I adapted some of the code to make sure the models can also deal with emerging, disappearing or shuffled features. The typing and documentation is probably still a bit off here and there, since I don't think I have the right linter to check for that. Maybe you could check it out some time 😅

Cheers,
Lucas

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Codecov Report

Attention: Patch coverage is 79.91886% with 99 lines in your changes missing coverage. Please review.

Project coverage is 79.82%. Comparing base (20ab012) to head (f07d3c0).
Report is 31 commits behind head on master.

Files	Patch %	Lines
deep_river/classification/rolling_classifier.py	52.17%	22 Missing ⚠️
deep_river/classification/classifier.py	70.58%	15 Missing ⚠️
deep_river/regression/rolling_regressor.py	51.85%	13 Missing ⚠️
deep_river/utils/layer_adaptation.py	87.62%	12 Missing ⚠️
deep_river/anomaly/ae.py	65.51%	10 Missing ⚠️
deep_river/regression/regressor.py	52.63%	9 Missing ⚠️
deep_river/base.py	88.33%	7 Missing ⚠️
deep_river/anomaly/probability_weighted_ae.py	60.00%	4 Missing ⚠️
deep_river/anomaly/rolling_ae.py	66.66%	4 Missing ⚠️
deep_river/regression/multioutput.py	75.00%	2 Missing ⚠️
... and 1 more

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage   74.90%   79.82%   +4.91%     
==========================================
  Files          24       26       +2     
  Lines        1104     1254     +150     
==========================================
+ Hits          827     1001     +174     
+ Misses        277      253      -24     

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