text: Title: Toml and maybe even yaml support 
  Body: ![Screenshot_20240119-085927](https://github.com/pydantic/pydantic-settings/assets/4039449/788b353f-a9d7-4870-976d-f361d70a260a)
  
  Google suggestions makes me think toml parsing support would be very popular, we might as well also do yaml, it shouldn't be much more work.
  
  We should use the builtin toml parser when possible, and have optional dependency groups.