Add GeoNRW dataset

[nilsleh]

This PR adds the GeoNRW dataset:

• GitHub
• paper

As it is licensed under CC-BY-4.0, I put it on HF for easier usage.

TODOS:

• write unit tests
• automatic download and verify
• check plotting because it seems off, although I followed this
  

[nilsleh]

@isaaccorley Could you take a look at the plotting, and possibly find a mistake based on their code and this implementation, since there seem to be some visual discrepancies between optical and segmentation image?

[adamjstewart]

Will investigate the plotting code and get back to you.

[adamjstewart]

As it is licensed under CC-BY-4.0, I put it on HF for easier usage.

You need to provide attribution (a link to the original version/authors) and list any modifications you made to the dataset (preprocessing?). Can you update the HF README?

See https://creativecommons.org/licenses/by/4.0/deed.en

[adamjstewart]

Note to self: this dataset requires PIL built with jpeg2000 support, not just regular jpeg. We can update the Spack recipe to include this.

[adamjstewart]

I successfully downloaded, loaded, and plotted the data. Seems like all TODOs are now complete.