[FEA] Perform slice in drop_nulls if cudf_polars Column `is_sorted`
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cudf-polars
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Description
(Identified by Claude)
If the input `Column.is_sorted` and `Column.null_count > 0`, it may be more performant just to slice off the `null_count` number of rows depending the `Column.null_order`
https://github.com/rapidsai/cudf/blob/01c7adae10d12da7a175fb616300f8190522b6e0/python/cudf_polars/cudf_polars/dsl/expressions/unary.py#L338-L341
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