Ollama: Calculator tool use example

[akashjss]

Description

Please include:

• Summary of changes: A cookbook example of calculator tool use with Ollama.

Fixes # (issue)

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
• Infrastructure change

Checklist

• My code follows Phidata's style guidelines and best practices
• I have performed a self-review of my code
• I have added docstrings and comments for complex logic
• My changes generate no new warnings or errors
• I have added cookbook examples for my new addition (if needed)
• I have updated requirements.txt/pyproject.toml (if needed)
• I have verified my changes in a clean environment

Additional Notes

Include any deployment notes, performance implications, or other relevant information:

[ysolanky]

@akashjss thank you for the PR! But adding the calculator example to Ollama cookbooks would be inconsistent with the other providers. We try and keep all example agents for the providers the same.

Example usage of calculator tool can be found over here: https://github.com/phidatahq/phidata/blob/main/cookbook/tools/calculator_tools.py