AWS Bedrock integration improvement

Outline & Motivation

The previous integration from the community lacks these points

1. This client needs a lot more work to be fully functional.
2. Setup the AWS credentials instruction is unclear
3. Access to the modelId (where to find these modelId)
4. Convert the modelId to standard model parameter that is required by model_client with a unified interface

Pitch

No response

Additional context

You can refer aisuite's aws provider . This can quickly get you up to speed on the experience that we want to create