add(lint): rwlock_atomic and rwlock_integer

[Tunglies]

changelog: new lint: [rwlock_atomic]
changelog: new lint: [rwlock_integer]

Reference clippy::mutex_atomic and clippy::mutex_integer, wrote two lints for RwLock usage.

[rustbot]

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[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.