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Slice<T>::iterator to be contiguous and random_access #1393

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rust::Vec fails std::ranges::contiguous_range checks as those have to satisfy random_access_range, and contiguous_iterator. This has caused mismatches with certain span types in other codebases.

This PR adds the necessary increment and concept category to Slice<T>::iterator, to correct this issue.

Bug: #1392

`rust::Vec` fails `std::ranges::contiguous_range` checks as those have
to satisfy `random_access_range`, and `contiguous_iterator`. This has
caused mismatches with certain `span` types in other codebases.

This PR adds the necessary increment and concept category to
`Slice<T>::iterator`, to correct this issue.

Bug: dtolnay#1392
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I see, I didn't realise this project wasn't using cxx20 yet.

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