Add unit tests
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test_fetch_series_by_code
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test_fetch_series_by_code_mask
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test_fetch_series_by_code_mask_with_plus_in_dimension_code
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test_fetch_series_by_id
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test_fetch_series_by_ids_in_same_dataset
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test_fetch_series_by_ids_in_different_datasets
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test_fetch_series_by_dimension
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test_fetch_series_of_dataset
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test_fetch_series_by_api_link
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test_fetch_series_with_na_values
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test_fetch_series_with_max_nb_series
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test_fetch_series_with_filter_on_one_series
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test_fetch_series_with_filter_on_one_series_with_filter_error
(Source: test suite of the Python client (https://git.nomics.world/dbnomics/dbnomics-python-client/blob/master/tests/test_client.py))