Enable pydocstyle (D) ruff rule and add more docs (#21)

* Use pydocstyle (D) rule with google convention

Add a ruff rule to catch missing documentation. Using google convention so that undocumented-param (D417) rule is enabled to catch missing params, xref https://docs.astral.sh/ruff/rules/undocumented-param. Extended to include D213 (instead of D212) and D410 rules too.

* Fix D100 Missing docstring in public module

* Fix D101 Missing docstring in public class

* Fix D103 Missing docstring in public function

Also ignore rule D205 to allow first sentence of docstring to wrap to multiple lines.

* Fix  D417 Missing argument description in the docstring

* Update indent in pyproject.toml file

tests/test_api.py

@@ -1,3 +1,5 @@
+"""Tests for chat API endpoint."""
+
 from uuid import uuid4
 
 import pytest
@@ -10,7 +12,7 @@ from geo_assistant.api.app import app
 
 @pytest_asyncio.fixture
 async def initialized_app():
-    """Initialize the app's chatbot before testing"""
+    """Initialize the app's chatbot before testing."""
     # Manually initialize the chatbot as the lifespan would
     app.state.chatbot = await create_graph()
     yield app
@@ -21,6 +23,7 @@ async def initialized_app():
 
 @pytest.mark.xfail
 async def test_call_api(initialized_app):
+    """Test calling the API at the /chat HTTP POST endpoint."""
     async with AsyncClient(
         transport=ASGITransport(app=initialized_app),
         base_url="http://test",