What's changing

Use Pydantic + yaml to store and parse configurations and hyperparameters for finetuning.

Closes #11

How to test it

Steps to test the changes:

1. Set your model id, dataset id, language etc in config.yaml
2. Run python finetune_whisper.py
3. Verify that the values you set are the ones used by checking the logs

Additional notes for reviewers

Anything you'd like to add to help the reviewer understand the changes you're proposing.

I already...

• Tested the changes in a working environment to ensure they work as expected
• Added some tests for any new functionality
• Updated the documentation (both comments in code and under /docs)