feat: wip creating abstract route layers

docs/source/conf.py

pyproject.toml

semantic_router/__init__.py

semantic_router/index/__init__.py

semantic_router/index/base.py

semantic_router/index/hybrid_local.py

semantic_router/index/local.py

semantic_router/routers/__init__.py

semantic_router/routers/base.py

semantic_router/routers/hybrid.py

semantic_router/routers/semantic.py

tests/unit/test_hybrid_layer.py

tests/unit/test_router.py

tests/unit/test_sync.py