Implement `with_hasher` adaptors#1007

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424ever wants to merge 7 commits intorust-itertools:masterfrom

424ever:with_hasher

Commits on Apr 20, 2026

Add `duplicates_[by_]with_hasher()`

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Add `unique_[by_]with_hasher()`

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Add `all_unique_with_hasher()`

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Add `into_group_map_[by_]with_hasher`

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Add `into_grouping_map_[by_]with_hasher`

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Add `counts_[by_]with_hasher()`

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Add tests for `with_hasher` methods

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