Merge branch 'add_tfidf' of https://github.com/digriffiths/semantic-router into add_tfidf

coverage.xml

dist/semantic_router-0.0.9-py3-none-any.whl

dist/semantic_router-0.0.9.tar.gz

docs/examples/function_calling.ipynb

docs/examples/test.ann

poetry.lock

pyproject.toml

semantic_router/encoders/openai.py

tests/unit/encoders/test_openai.py