Merge pull request #209 from aurelio-labs/zahid/filter

docs/09-route-filter.ipynb

docs/indexes/qdrant.ipynb

poetry.lock

semantic_router/index/base.py

semantic_router/index/local.py

semantic_router/index/pinecone.py

semantic_router/index/qdrant.py

semantic_router/layer.py

tests/unit/test_layer.py