Feat/auto-regression and future values of past covariates documentation #4503

Job	Run time
lint	46s
tests (macos-latest, 3.9, all)	46m 30s
check-examples (03-FFT-examples.ipynb)	3m 33s
tests (ubuntu-latest, 3.9, all)	30m 56s
docs	6m 58s
check-examples (04-RNN-examples.ipynb)	7m 48s
check-examples (00-quickstart.ipynb)	6m 52s
check-examples (02-data-processing.ipynb)	6m 30s
check-examples (01-multi-time-series-and-covariates.ipynb)	7m 14s
	1h 57m 7s

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