feat: allow stride=forecast_horizon for anomaly forecasting model #5619

Job	Run time
check-examples (03-FFT-examples.ipynb)	1m 17s
check-examples (04-RNN-examples.ipynb)	5m 19s
lint	28s
check-examples (00-quickstart.ipynb)	5m 51s
tests (macos-13, 3.10, all)	37m 54s
check-examples (02-data-processing.ipynb)	2m 22s
docs	5m 41s
tests (ubuntu-latest, 3.10, all)	30m 41s
check-examples (01-multi-time-series-and-covariates.ipynb)	4m 32s
	1h 34m 5s

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