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## Summary This PR adds the implementation for the current [flake8-bugbear](https://github.com/PyCQA/flake8-bugbear)'s B038 rule. The B038 rule checks for mutation of loop iterators in the body of a for loop and alerts when found. Rational: Editing the loop iterator can lead to undesired behavior and is probably a bug in most cases. Closes #9511. Note there will be a second iteration of B038 implemented in `flake8-bugbear` soon, and this PR currently only implements the weakest form of the rule. I'd be happy to also implement the further improvements to B038 here in ruff 🙂 See https://github.com/PyCQA/flake8-bugbear/issues/454 for more information on the planned improvements. ## Test Plan Re-using the same test file that I've used for `flake8-bugbear`, which is included in this PR (look for the `B038.py` file). Note: this is my first time using `rust` (beside `rustlings`) - I'd be very happy about thorough feedback on what I could've done better 🙂 - Bring it on 😀