add frequency validation and futr_df debugging methods #833
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Adds a frequency validation that makes sure the times and frequency match (e.g. both ints, timestamps + pandas or polars offset).
Also adds the following methods:
NeuralForecast.make_future_dataframe
: provides the expected combinations of ids and dates to serve as a base when providingfutr_df
.NeuralForecast.get_missing_future
: takes thefutr_df
and returns which combinations are missing for easier debugging.