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PERF: Bypass chunking/validation logic in StringDtype__from_arrow__ (#47781)
* Bypass chunking/validation logic in __from_arrow__
Instead of converting each chunk to a StringArray after casting to
array and then concatenating, instead use pyarrow to concatenate chunks
and convert to numpy.
Finally, we bypass validation the validation logic by initializing
NDArrayBacked instead of StringArray.
* Handle zero-chunks correctly & convert None to NA
* Add change to whatsnew
* Add to v2 whatsnew
* Add GH issue to comment about validation bypass
* Add # to GH issue
* Move release note to v2.1.0
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