[FIX] Add tests for custom endpoint and abstract call api method

[AzulGarza]

This PR fixes #141 and adds the _call_api method that handles any request to the API.

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Experiment 1: air-passengers

Description:

variable	experiment
h	12
season_length	12
freq	MS
level	None
n_windows	1

Results:

metric	TimeGPT	SeasonalNaive	Naive
mae	12.6793	47.8333	76
mape	0.027	0.0999	0.1425
mse	213.936	2571.33	10604.2
total_time	5.3525	8.0159	0.7256

Plot:

Experiment 2: air-passengers

Description:

variable	experiment
h	24
season_length	12
freq	MS
level	None
n_windows	1

Results:

metric	TimeGPT	SeasonalNaive	Naive
mae	58.1031	71.25	115.25
mape	0.1257	0.1552	0.2358
mse	4040.21	5928.17	18859.2
total_time	2.7818	0.0069	0.0066

Plot:

Experiment 3: electricity-multiple-series

Description:

variable	experiment
h	24
season_length	24
freq	H
level	None
n_windows	1

Results:

metric	TimeGPT	SeasonalNaive	Naive
mae	4.8617	5.6289	5.2381
mape	0.6816	0.7654	0.6328
mse	40.5749	63.023	50.8454
total_time	3.2147	0.0153	0.0165

Plot:

Experiment 4: electricity-multiple-series

Description:

variable	experiment
h	168
season_length	24
freq	H
level	None
n_windows	1

Results:

metric	TimeGPT	SeasonalNaive	Naive
mae	8.3102	9.3176	12.6464
mape	1.382	1.0786	1.4208
mse	165.13	202.596	336.086
total_time	3.2646	0.0175	0.016

Plot:

Experiment 5: electricity-multiple-series-with-ex-vars

Description:

variable	experiment
h	24
season_length	24
freq	H
level	None
n_windows	1

Results:

metric	TimeGPT	SeasonalNaive	Naive
mae	5.5206	5.6289	5.2381
mape	0.4674	0.7654	0.6328
mse	40.9623	63.023	50.8454
total_time	3.7457	0.8022	0.479

Plot:

Experiment 6: electricity-multiple-series-with-ex-vars

Description:

variable	experiment
h	168
season_length	24
freq	H
level	None
n_windows	1

Results:

metric	TimeGPT	SeasonalNaive	Naive
mae	7.5605	9.3176	12.6464
mape	1.371	1.0786	1.4208
mse	135.78	202.596	336.086
total_time	3.8797	0.0209	0.0196

Plot: