Omar Leonardo Sanchez Granados 4f2816c01c
Add support to boto3 default connection (#5246)
### What problem does this PR solve?
 
This pull request includes changes to the initialization logic of the
`ChatModel` and `EmbeddingModel` classes to enhance the handling of AWS
credentials.

Use cases:
- Use env variables for credentials instead of managing them on the DB 
- Easy connection when deploying on an AWS machine

### Type of change

- [X] New Feature (non-breaking change which adds functionality)
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