✨ Add docs and tests for Python 3.9 and Python 3.10 (#3712)

Co-authored-by: Thomas Grainger <tagrain@gmail.com>

docs_src/path_params_numeric_validations/tutorial001_py310.py

@@ -0,0 +1,14 @@
+from fastapi import FastAPI, Path, Query
+
+app = FastAPI()
+
+
+@app.get("/items/{item_id}")
+async def read_items(
+    item_id: int = Path(..., title="The ID of the item to get"),
+    q: str | None = Query(None, alias="item-query"),
+):
+    results = {"item_id": item_id}
+    if q:
+        results.update({"q": q})
+    return results