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Avoid forced copy in step_setnames() and rename_with() #486

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Avoid forced copy in step_setnames() and rename_with() #486

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step_setnames() and rename_with() will now not force a copy() if lazy_dt() was called with immutable = FALSE. In line with how mutate() and relocate() already behave.

Added test for rename() with immutable = FALSE. Updated expected result of pivot_wider() test, as the call to step_setnames() triggered an unnecessary copy() there too, which is now also avoided.

Fixes #485

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rename() and rename_with() trigger copy() despite immutable = FALSE
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