Feat/MIDAS transformer #4491

Job	Run time
lint	1m 26s
lint	1m 26s
docs	9m 20s
docs	9m 20s
check-examples (03-FFT-examples.ipynb)	4m 40s
check-examples (03-FFT-examples.ipynb)	4m 40s
tests (macos-latest, 3.9, all)	39m 55s
tests (macos-latest, 3.9, all)	44m 36s
check-examples (04-RNN-examples.ipynb)	11m 4s
check-examples (04-RNN-examples.ipynb)	11m 4s
tests (ubuntu-latest, 3.9, all)	31m 56s
tests (ubuntu-latest, 3.9, all)	31m 56s
check-examples (00-quickstart.ipynb)	6m 29s
check-examples (00-quickstart.ipynb)	6m 29s
check-examples (02-data-processing.ipynb)	6m 31s
check-examples (02-data-processing.ipynb)	6m 31s
check-examples (01-multi-time-series-and-covariates.ipynb)	7m 8s
check-examples (01-multi-time-series-and-covariates.ipynb)	7m 8s
	4h 1m 39s

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