[typing] Add typing for user facing functions

[noxan]

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Close #1134

[github-actions]

Model Benchmark

Benchmark	Metric	main	current	diff
YosemiteTemps	MAE_val	1.71298	1.71298	0.0%	✅
YosemiteTemps	RMSE_val	2.2607	2.2607	0.0%	✅
YosemiteTemps	Loss_val	0.00095	0.00095	0.0%	✅
YosemiteTemps	MAE	1.45187	1.45187	0.0%	✅
YosemiteTemps	RMSE	2.16721	2.16721	0.0%	✅
YosemiteTemps	Loss	0.00066	0.00066	0.0%	✅
YosemiteTemps	time	93.722	91.69	-2.17%	✅
AirPassengers	MAE_val	15.2698	15.2698	0.0%	✅
AirPassengers	RMSE_val	19.4209	19.4209	0.0%	✅
AirPassengers	Loss_val	0.00195	0.00195	0.0%	✅
AirPassengers	MAE	9.82902	9.82902	0.0%	✅
AirPassengers	RMSE	11.7005	11.7005	0.0%	✅
AirPassengers	Loss	0.00056	0.00056	0.0%	✅
AirPassengers	time	3.80609	4.05	6.41%	⚠️
PeytonManning	MAE_val	0.58159	0.58159	0.0%	✅
PeytonManning	RMSE_val	0.72216	0.72216	0.0%	✅
PeytonManning	Loss_val	0.01239	0.01239	0.0%	✅
PeytonManning	MAE	0.41671	0.41671	0.0%	✅
PeytonManning	RMSE	0.55961	0.55961	0.0%	✅
PeytonManning	Loss	0.00612	0.00612	0.0%	✅
PeytonManning	time	11.1953	11.55	3.17%	⚠️

Model training plots

Model Training

PeytonManning

YosemiteTemps

AirPassengers

[codecov-commenter]

Codecov Report

Merging #1193 (1eeed2f) into main (f2ce25f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##             main    #1193   +/-   ##
=======================================
  Coverage   89.53%   89.53%           
=======================================
  Files          35       35           
  Lines        4798     4799    +1     
=======================================
+ Hits         4296     4297    +1     
  Misses        502      502           

Impacted Files	Coverage Δ
neuralprophet/configure.py	90.22% <100.00%> (ø)
neuralprophet/df_utils.py	94.80% <100.00%> (ø)
neuralprophet/forecaster.py	88.53% <100.00%> (+0.01%)	⬆️
neuralprophet/utils.py	79.58% <100.00%> (ø)

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[LeonieFreisinger]

@noxan Thanks for adding typing to the relevant functions! Great effort.