feat: add mem0ai dependency to pyproject.toml

[StanGirard]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context.

Checklist before requesting a review

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• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my code
• [ ] I have commented hard-to-understand areas
• [ ] I have ideally added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged

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