✨ Add support for function return type annotations to declare the response_model (#1436)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

docs_src/response_model/tutorial001_py310.py

@@ -1,3 +1,5 @@
+from typing import Any
+
 from fastapi import FastAPI
 from pydantic import BaseModel
 
@@ -13,5 +15,13 @@ class Item(BaseModel):
 
 
 @app.post("/items/", response_model=Item)
-async def create_item(item: Item):
+async def create_item(item: Item) -> Any:
     return item
+
+
+@app.get("/items/", response_model=list[Item])
+async def read_items() -> Any:
+    return [
+        {"name": "Portal Gun", "price": 42.0},
+        {"name": "Plumbus", "price": 32.0},
+    ]