Make all configs nicely readable
### Feature request

All configs nicely readable (tokenizers & feature extractor)

### Motivation

https://huggingface.co/facebook/opt-30b/discussions/1

### Your contribution

Happy to do it early next week - happy if someone else wants to take it over though! 
in strong favor of this!<|||||>PR: https://github.com/huggingface/transformers/pull/17457