Add new lints: const_sized_chunks_exact, const_sized_chunks_exact_mut, and const_sized_windows

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This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

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⚠️ Warning ⚠️

• The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.

  • 35bc2af

  You can start a rebase with the following commands:

  $ # rebase
  $ git pull --rebase https://github.com/rust-lang/rust-clippy.git master
  $ git push --force-with-lease
  

[github-actions]

Lintcheck changes for 35bc2af

Lint	Added	Removed	Changed
clippy::const_sized_chunks_exact	3	0	0
clippy::const_sized_windows	1	0	0

This comment will be updated if you push new changes

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