Fix View::to_polars and add LargeUTF8 Arrow dictionary support
#2924
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This PR fixes the Python
View::to_polarsfunction to work and adds a test.While attempting to implement transitive testing (perspective -> polars -> perspective), I realized Polars stores dictionary columns in the uncommon
LargeUTF8dictionary format, which caused segfaults in our u32-indexed dictionary reading code. As a result, this PR also adds support for Arrow/PyArrowLargeUTF8dictionary columns.