Mixed cached dataset

Dataset that combines and handles multiple cached datasets.

This is useful for multiple qubits. Here we also handle paddings.

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MixedCachedOpenCLIPDatasetConfig

 MixedCachedOpenCLIPDatasetConfig (store_dict:dict, dataset_to_gpu:bool,
                                   pad_constant:int, collate_fn:str,
                                   bucket_batch_size:int,
                                   model_scale_factor:int)

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MixedCachedOpenCLIPDataset

 MixedCachedOpenCLIPDataset (device:torch.device=device(type='cpu'),
                             save_type=None, **parameters)

Dataset that uses multiple cached dataset and combines them with padding, either i) Bucket or ii) Max.