Add import sort to formatter

I had thought this was enabled by default but it wasn't.  This just
means our imports will be sorted in a more standard / predictable way.

pyproject.toml

@@ -9,3 +9,6 @@ markers = [
   "unit: mark a test as a unit test.",
   "integration: mark a test as an integration test."
 ]
+
+[tool.ruff.lint]
+extend-select = ["I"]

service/main.py

 import uvicorn
 from fastapi import FastAPI
-from fastapi.responses import RedirectResponse
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import RedirectResponse
 
 
 from service.api.routers import presigned_posts

tests/test_presigned_posts.py

 import pytest
 from fastapi.testclient import TestClient
-from starlette.status import HTTP_422_UNPROCESSABLE_ENTITY, HTTP_200_OK
+from starlette.status import HTTP_200_OK, HTTP_422_UNPROCESSABLE_ENTITY
 
 from service.core.settings import settings
 from service.main import app