[Minor] Move max_lags, prediction_freq to config_model and n_lags to config_ar

[ourownstory]

Additionally clean up few items from #1636, such as fourier functions

[github-actions]

Model Benchmark

Benchmark	Metric	main	current	diff
PeytonManning	MAE_val	0.35028	0.35033	0.02%	✅
PeytonManning	RMSE_val	0.50092	0.50095	0.01%	✅
PeytonManning	Loss_val	0.01774	0.01775	0.01%	✅
PeytonManning	MAE	0.34667	0.34667	-0.0%	✅
PeytonManning	RMSE	0.49358	0.49357	-0.0%	✅
PeytonManning	Loss	0.01466	0.01466	-0.0%	✅
PeytonManning	LR	0.00032	0.00032	0.0%	✅
PeytonManning	time	15.0334	14.77	-1.75%	✅
AirPassengers	MAE_val	30.1289	30.1315	0.01%	✅
AirPassengers	RMSE_val	31.0819	31.0835	0.01%	✅
AirPassengers	Loss_val	0.01242	0.01242	0.01%	✅
AirPassengers	MAE	6.12209	6.12226	0.0%	✅
AirPassengers	RMSE	7.80953	7.80921	-0.0%	✅
AirPassengers	Loss	0.00064	0.00064	-0.0%	✅
AirPassengers	LR	0.0004	0.0004	0.0%	✅
AirPassengers	time	8.62392	8.42	-2.36%	✅
EnergyPriceDaily	MAE_val	5.4019	5.40186	-0.0%	✅
EnergyPriceDaily	RMSE_val	6.70638	6.70655	0.0%	✅
EnergyPriceDaily	Loss_val	0.02518	0.02519	0.01%	✅
EnergyPriceDaily	MAE	5.91313	5.91309	-0.0%	✅
EnergyPriceDaily	RMSE	7.94013	7.94008	-0.0%	✅
EnergyPriceDaily	Loss	0.02554	0.02554	-0.0%	✅
EnergyPriceDaily	LR	0.00029	0.00029	0.0%	✅
EnergyPriceDaily	time	19.5285	19.93	2.06%	✅
YosemiteTemps	MAE_val	0.57299	0.57336	0.06%	✅
YosemiteTemps	RMSE_val	0.84755	0.84714	-0.05%	✅
YosemiteTemps	Loss_val	0.00042	0.00042	-0.1%	✅
YosemiteTemps	MAE	0.93964	0.93956	-0.01%	✅
YosemiteTemps	RMSE	1.65623	1.65601	-0.01%	✅
YosemiteTemps	Loss	0.00118	0.00118	-0.03%	✅
YosemiteTemps	LR	0.0001	0.0001	0.0%	✅
YosemiteTemps	time	58.2009	59.01	1.39%	✅

Model training plots

Model Training

PeytonManning

YosemiteTemps

AirPassengers

EnergyPriceDaily