converting defaultdict to dict in RunResponse.to_dict() - #2005

asdict doesn't support defaultdict in Python 3.11. So converting RunResponse.metrics to dict before running asdict.

Description

• Summary of changes: Converting RunResponse.metrics to dict in RunResponse.to_dict()
• Related issues: bpo-35540 dataclasses.asdict support defaultdict fields python/cpython#32056
• Motivation and context: asdict doesn't support defaultdict in Python 3.11. So RunResponse.to_dict() doesn't work.
• Environment or dependencies: None
• Impact on metrics: (If applicable) None

Fixes # (issue)

asdict doesn't support defaultdict in Python 3.11. So RunResponse.to_dict() doesn't work.
https://github.com/python/cpython/pull/32056c

Type of change

Please check the options that are relevant:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Model update (Addition or modification of models)
• Other (please describe):

Checklist

• Adherence to standards: Code complies with Agno’s style guidelines and best practices.
• Formatting and validation: You have run ./scripts/format.sh and ./scripts/validate.sh to ensure code is formatted and linted.
• Self-review completed: A thorough review has been performed by the contributor(s).
• Documentation: Docstrings and comments have been added or updated for any complex logic.
• Examples and guides: Relevant cookbook examples have been included or updated (if applicable).
• Tested in a clean environment: Changes have been tested in a clean environment to confirm expected behavior.
• Tests (optional): Tests have been added or updated to cover any new or changed functionality.

Additional Notes

Include any deployment notes, performance implications, security considerations, or other relevant information (e.g., screenshots or logs if applicable).