Move train and validation into boosted_dataset/

#2
{village_boosted_dataset_cc_dir → boosted_dataset/village_boosted_dataset_cc_dir}/biome_labels.npy RENAMED
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{village_boosted_dataset_cc_dir → boosted_dataset/village_boosted_dataset_cc_dir}/voxels_shards/voxels-00000-of-00003.npy RENAMED
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{village_boosted_dataset_cc_dir → boosted_dataset/village_boosted_dataset_cc_dir}/voxels_shards/voxels-00001-of-00003.npy RENAMED
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{village_boosted_dataset_cc_dir → boosted_dataset/village_boosted_dataset_cc_dir}/voxels_shards/voxels-00002-of-00003.npy RENAMED
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{village_boosted_dataset_cc_val_dir → boosted_dataset/village_boosted_dataset_cc_val_dir}/biome_labels.npy RENAMED
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{village_boosted_dataset_cc_val_dir → boosted_dataset/village_boosted_dataset_cc_val_dir}/voxels_shards/voxels-00000-of-00001.npy RENAMED
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