Make the new datamodules more generic

[WanjiruCate]

Is your feature request related to a problem? Please describe.
While using the new dataset specific datamodules like Sen1Floods11NonGeoDataModule , it is not possible to pass specific means and stds for another similar dataset i.e like a subset of it.

The new datamodules only accept a data_root that is expected to be a folder with the specified names described in the datasets.

Describe the solution you'd like
With the above problem it is not possible to scale easily for adding different datasets with different folder structures or different statistics.
It should be possible to override the default means, stds, data_root filesof the specific datamodules in the tuning config.

Describe alternatives you've considered (optional)
To continue using the generic datamodules as they allow the requested feature.

Additional context (optional)
Is there any added advantage to use the specific dataset datamodules compared to the generic ones?

[WanjiruCate]

@Joao-L-S-Almeida here is the issue.

[Joao-L-S-Almeida]

Thanks @WanjiruCate.