Enable pytest-asyncio tests in CI (#3)

* Set asyncio_mode="auto" in pytest.ini config

Xref https://pytest-asyncio.readthedocs.io/en/latest/reference/configuration.html#asyncio-mode

* Add test-python GitHub Actions CI workflow

* Add `--color=yes` flag to force GitHub Actions logs to have color

Xref https://github.com/pytest-dev/pytest/issues/7443

* Refactor contents of test_api.py slightly

Using some ruff rules

* Delete test_api.py

* Make test_get_place async

* Make get_place async, and call .ainvoke method on it

src/geo_assistant/tools/overture.py

@@ -1,10 +1,11 @@
-from typing import Annotated
-import duckdb
 import json
-from langchain_core.tools import tool
-from langgraph.types import Command
+from typing import Annotated
+
+import duckdb
 from langchain_core.messages import ToolMessage
+from langchain_core.tools import tool
 from langchain_core.tools.base import InjectedToolCallId
+from langgraph.types import Command
 
 
 def create_database_connection():
@@ -15,6 +16,7 @@ def create_database_connection():
 
     Returns:
         Configured DuckDB connection
+
     """
     connection = duckdb.connect()
     connection.execute("INSTALL spatial;")
@@ -25,7 +27,7 @@ def create_database_connection():
 
 
 @tool
-def get_place(
+async def get_place(
     place_name: str, tool_call_id: Annotated[str, InjectedToolCallId] = ""
 ) -> Command:
     """Get place location from Overture Maps based on user input place name."""