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REF: ArrowBackedExtensionArray #46008

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@jbrockmendel

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@jbrockmendel

We should refactor out parts of ArrowStringArray and tests.extension.arrow.arrays.ArrowExtensionArray that can be re-used for more general arrow-based EAs.

A couple of questions that came up in my first pass at this (cc @jorisvandenbossche):

  • Should the general case allow backing by either pa.Array or pa.ChunkedArray, or just pa.ChunkedArray?
  • ArrowStringArray.copy relies on immutability. Will that be the case in general? If not, how do we check for it?
  • Is the more verbose nbytes in ArrowExtensionArray more robust/correct than the one in ArrowStringArray?
  • Are the slightly-different _concat_same_type methods equivalent? Usable for the general case?

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