Improve/bands definition

[Joao-L-S-Almeida]

It adds support to a easier way to define the dataset and output bands when there are many variables.
Now the bands can be defined by intervals:

output_bands:
 -  [0,10]

Or subintervals:

output_bands:
 - [0,5]
 - [5,10]
 

See tests/manufactured-finetune_prithvi_swin_B_band_interval.yaml for more details.

Furthermore, the bands also can be defined via strings, as:

dataset_bands:
 -  "band_0"
 -  "band_1"
 -  "band_2"
 -  "band_3"
 
 output_bands:
 - "band_1"
 - "band_2"

[CarlosGomes98]

Just some initial comments, have not been able to finish the review yet

[CarlosGomes98]

@Joao-L-S-Almeida I like the idea of the ranges! However, in this idea, I am wondering if it makes sense to still retain dataset_bands.

Maybe what makes most sense is to give users two options:

1. Use dataset_bands to name your bands using strings or HLSBands (or ints?) and then output_bands will match those.
2. Use only output_bands without naming the bands with dataset_bands, in which case we can then accept ints or ranges as a tuple of two ints.

What caught my attention was that, when using ranges, having to specify that same range in dataset_bands is sort of pointless

What do you think?

[CarlosGomes98]

Also, lets make sure to add documentation for this new feature! (extending the docstrings is probably enough)