[OTHER] Add codeowners

### I have searched through the issues and didn't find my problem.

- [X] Confirm

### What would you like to share?

By adding codeowners, we can request a review from those people in every created PR.
This can help a lot so that we don't have to repeatedly request a review from those people.

We should add the most active maintainers for now.
If anyone should be added or removed, we can always change that. 🙂

### Additional information

_No response_