More efficient read_xarray implementation with from_map_batched#63
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I created a lightweight iterator over batches called
from_map_batched, which uses a pyarrow RecordBatchReader to stream in batches one by one. This is not the ideal of a streaming dataset, which after lots of research, requires a TabeProvider via a FFI. But, it is a memory-efficient improvement over the present implementation.This PR provides other small refactorings and reformattings.