2135.feature.md

Add batch_converter parameter and multiprocessing support to {class}~anndata.experimental.pytorch.AnnLoader.

• Added batch_converter parameter for batch-level post-processing of data batches
• Added {func}~anndata.experimental.pytorch.batch_dict_converter helper function for converting batches to tensor dictionaries
• Fixed multiprocessing support (num_workers > 0) by implementing pickling for AnnCollectionView objects
• Batch converters now work seamlessly with both single-threaded and multi-threaded data loading

{user}ronamit