fix: preserve stringdtype in zarr v3 round trips - #11474
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Zarr format 3 round trips lose native NumPy StringDType metadata. The shared string encoder converts native StringDType arrays to fixed-width Unicode before Zarr format 3 stores them.
Preserve native NumPy StringDType for variables, coordinates, and scalars in Zarr format 3 round trips.
Use the compatibility path when StringDType defines
na_object.Closes #11466.
whats-new.rst.