Add AWS SSO support to AmazonBedrock service

[wjdwndud0114]

Summary

• Add support for AWS SSO authentication in the AmazonBedrock service client
• Introduce aws_profile configuration option for SSO and profile-based authentication
• Restructure boto3 session and client initialization for better credential handling

Changes

• Added aws_profile config key to support AWS SSO profiles
• Separated session creation (for profile handling) from client creation (for explicit credentials)
• Updated documentation to explain SSO usage and credential precedence
• Added comments to clarify the authentication flow

Benefits

• Users can now authenticate using AWS SSO profiles without explicit credentials
• Falls back to boto3's standard credential chain when no profile is specified
• Maintains backward compatibility with existing explicit credential configurations

Usage

For AWS SSO users, set aws_profile to your SSO profile name:

[service]
service = bedrock_service

[bedrock_service]
api_type = bedrock
aws_profile = claude
aws_region = us-east-1
model = us.anthropic.claude-sonnet-4-5-20250929-v1:0

Then run: aws sso login --profile my-sso-profile

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