Why are these changes needed?

Amazon Bedrock also offers a broad set of capabilities to build generative AI applications with security, privacy, and responsible AI. The AWS bedrock has acquired all the latest open-source and closed-source models for inference, making it more flexible for the users to manage the complete infrastructure from AWS. this addition will increase the capability of AutoGen to support the models from bedrock.

API Documentation:https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_Converse.html

For testing:

# Authentication parameters:# aws_region (mandatory)# aws_access_key (or environment variable: AWS_ACCESS_KEY)# aws_secret_key (or environment variable: AWS_SECRET_KEY)# aws_session_token (or environment variable: AWS_SESSION_TOKEN)# aws_profile_nameconfig_list = [    {        "api_type": "bedrock",        "model": "meta.llama3-1-8b-instruct-v1:0",        "aws_region": "us-west-2",        "aws_access_key": "",        "aws_secret_key": "",        "price" : [0.003, 0.015]    }]

Related issue number

Checks

• I've included any doc changes needed forhttps://microsoft.github.io/autogen/. Seehttps://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

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