bors 90cb25d3f6 Auto merge of #6177 - rust-lang:manual-range-contains, r=flip1995
New lint: manual-range-contains

This fixes #1110, at least for the contains-suggesting part.

- \[x] Followed [lint naming conventions][lint_naming]
- \[x] Added passing UI tests (including committed `.stderr` file)
- \[x] `cargo test` passes locally
- \[x] Executed `cargo dev update_lints`
- \[x] Added lint documentation
- \[x] Run `cargo dev fmt`
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changelog: new lint: manual-range-contains
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