Add support for hourly data

[SarahAlidoost]

Currently our implementation (encoder_decoder, dataset class and utils) support daily data. To support hourly input data:

• The encoder_decoder and all model components remain unchanged. The architecture is completely agnostic to whether T=31 or T=744 (24*31). it just sees a temporal dimension to patch. The only model instantiation change is adjusting patch_size (e.g., patch_size=(24, 4, 4) for hourly) and max_days (e.g., max_days=744).
• The dataset class need changes.
• The util function add_month_day_dims doesnot work for hourly data. We need another function for hourly data.

[SarahAlidoost]

relates #15