Update codeowners with individual model owners

[Rocketknight1]

Right now, the CODEOWNERS file tags me to review everything, and this will cause me to die 🪦

This PR adds an autogenerated list of model owners. Right now it gets categories from _toctree.yml and default owners from ISSUE_TEMPLATE/bug_report.yml, but I can probably improve on this!

TODO:

• Split up text models, they shouldn't all go to @ArthurZucker
• Split up multimodal models, they got assigned to @zucchini-nlp but not all of them are VLMs

[ArthurZucker]

COol!
With this, I think a lot of people are still gonna get pinged on the image_processor (ex from the PR where everyone was pinged) like in the Emu PR!

But it might help if the owner just reviews that piece of code (the image processor) and approves it -> I don't even look at it!

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[qubvel]

Thanks for update!

[Rocketknight1]

Changed the globs to match /[model_name]/mod*_[model_name] so we capture modular and modeling changes