add EuroSAT prototype dataset

[Dbhasin1]

fixes #5338

[facebook-github-bot]

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[pmeier]

Thanks a lot for the PR @Dbhasin1! I only have some style nit inline. Apart from that, we should also add a test for the dataset. To do that you add a

@register_mock
def eurosat(info, root, config):
    ...

to the file test/builtin_dataset_mocks.py. The body of this function should generate mock data in the same structure of the original dataset, but with only a few samples. Luckily, we already have this functionality for the old dataset in

vision/test/test_datasets.py

Lines 2176 to 2190 in c530b62

	def inject_fake_data(self, tmpdir, config):
	data_folder = os.path.join(tmpdir, "eurosat", "2750")
	os.makedirs(data_folder)
	num_examples_per_class = 3
	classes = ("AnnualCrop", "Forest")
	for cls in classes:
	datasets_utils.create_image_folder(
	root=data_folder,
	name=cls,
	file_name_fn=lambda idx: f"{cls}_{idx}.jpg",
	num_examples=num_examples_per_class,
	)
	return len(classes) * num_examples_per_class

Thus, you only need to port this as well to the new architecture. Let me know if you face any issues with that.

[pmeier]

Two minor things left. Otherwise LGTM when CI is green. Thanks a lot @Dbhasin1!

[pmeier]

One minor thing left. Otherwise LGTM! Thanks a ton @Dbhasin1!

[NicolasHug]

stamping, thanks @Dbhasin1