test: add initial pytest coverage for ParadeDB hybrid search

Author: Restodecoca

llama-index-integrations/vector_stores/llama-index-vector-store-paradedb/tests/README.md

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+# Testing Setup
+
+You will need to start a postgres instance locally to run the tests for this integration. You can do this easily via docker cli:
+
+```
+docker run -d \
+  --name paradedb \
+  -e POSTGRES_USER=postgres \
+  -e POSTGRES_PASSWORD=mark90 \
+  -e POSTGRES_DB=postgres \
+  -p 5432:5432 \
+  paradedb/paradedb:latest
+```
+
+To clean up the created postgres DB, just run:
+
+```
+docker stop paradedb
+docker rm paradedb
+```

llama-index-integrations/vector_stores/llama-index-vector-store-paradedb/tests/__init__.py

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+# pants requires this import to recognize the dep
+import pytest_asyncio  # noqa: F401