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[Python] Clean up ExtensionType.__reduce__ #39094

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@AlenkaF

Describe the enhancement requested

Currently __reduce__ method is defined on the ExtensionType class so that each subclass can be pickled and doesn't need a separate __reduce__ method (see #36170).

But this can be cleaned up. Instead of defining __reduce__ for ExtensionType we can define __reduce__ on BaseExtensionType and make use of the C++-level (de)serialization. See #35933 (comment).

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