[FEA] Use `plc.stream_compaction.unique` + size for n_unique in cudf_polars if `Column.is_sorted`
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cudf-polars
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Description
(Identified by Claude)
If the input `Column.is_sorted`, it may be more performant just to use the size of the `plc.stream_compaction.unique` result for `n_unique`
https://github.com/rapidsai/cudf/blob/01c7adae10d12da7a175fb616300f8190522b6e0/python/cudf_polars/cudf_polars/dsl/expressions/aggregation.py#L60-L62
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