fix(rust,python): incomplete reading of list types from parquet #11578
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fixes #11548.
Error turned out to be from arrow2 / nano-arrow. The reading impl for nested types appears to be copied from the non-nested impl, and ended up inheriting some assumptions that weren't correct for nested types - namely it stopped loading the moment the row count matched the total. In practice this caused the last row in every row group for lists to be incomplete if their data was stored in more than one page.