Add ChromaDB client implementation with async support
- Implement core collection operations (create, get_or_create, delete)
- Add search functionality with cosine similarity scoring
- Include both sync and async method variants
- Add type safety with NamedTuples and TypeGuards
- Extract utility functions to separate modules
- Default to cosine distance metric for text similarity
- Add comprehensive test coverage
TODO:
- l2, ip score calculations are not settled on
