Features
* Add target encoder ([166a153](https://github.com/jordandelbar/feature-engineering-polars/commit/166a153d143d2143e7ed9a98922e4f8fa05b43da))
* Add tests for mean imputing and target encoding ([9d73a69](https://github.com/jordandelbar/feature-engineering-polars/commit/9d73a69d20076277138376f21fe7d5c362c45a84))
* Upgrade pre-commit hooks ([65b2b76](https://github.com/jordandelbar/feature-engineering-polars/commit/65b2b7690d1e0c4f5c304331ac766bfee4353d11))