Polars >=1.0 fixes.#256

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tjader wants to merge 8 commits intofunctime-org:mainfrom

tjader:plugin-registry-compat

Commits on Nov 3, 2024

Use recommended register_plugin_function whenever available. Fallback to old solution otherwise.
tjader
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Newer polars restricts automatic dtype checks to first element.
tjader
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Remove using hourly frequency for date_range (no longer supported). Add test for date as well as datetime for fourier terms.
tjader
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Remove setting set_sorted after sorting on multiple columns since - 1 sorting sets sorted_flag anyway, and 2 set_sorted only works on single column names.
tjader
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Avoid doing string replacement on a categorized column. Simplify pipe and remove redundant set_sorted.
tjader
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support rle struct fields name change.
tjader
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Tell map_element that functions return scalars.
tjader
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formatting fixes
tjader
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