Add new lint static_mut_vars

[faeroon]

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implements lint for checking static mut variables usage

changelog: [static_mut_vars]

• Followed lint naming conventions
• Added passing UI tests (including committed .stderr file)
• cargo test passes locally
• Executed cargo dev update_lints
• Added lint documentation
• Run cargo dev fmt

Fixes #4070.

[github-actions]

Lintcheck changes for 0b1c5a9

Lint	Added	Removed	Changed
clippy::static_mut_vars	7	0	0

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[rustbot]

r? @dswij

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[dswij]

r? clippy

[rustbot]

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.

[rustbot]

☔ The latest upstream changes (possibly #17751) made this pull request unmergeable. Please resolve the merge conflicts.