Add AWS Bedrock Provider

Resolves - #2

Summary

This PR adds support for the AWS Bedrock provider to the project, enabling integration with Amazon Bedrock models via the new llm-bedrock component.

Key Changes

• Introduced a new provider: llm-bedrock
• Implemented all required traits and interfaces for Bedrock integration
• Added a test harness and configuration for Bedrock in tests/bedrock-test
• Updated workspace and build scripts to include the new provider
• Ensured compatibility with existing project structure and conventions

Testing

• The provider builds successfully and integrates with the test harness.
• The test attempts to invoke the AWS Bedrock model using credentials loaded from .env.
• Note: Actual model invocation requires AWS account access to Bedrock models. If you encounter AccessDeniedException or Unavailable errors, request model access via the AWS Console or AWS Support.

Additional Notes

• Both test/ and tests/ folders are present by design; see the README for details.
• All code and configuration changes follow project conventions.

/claim #2