✨ Add support for not needing ... as default value in required Query(), Path(), Header(), etc. (#4906)

* ✨ Do not require default value in Query(), Path(), Header(), etc

* 📝 Update source examples for docs with default and required values

* ✅ Update tests with new default values and not required Ellipsis

* 📝 Update docs for Query params and update info about default value, required, Ellipsis

docs_src/path_params_numeric_validations/tutorial005.py

@@ -6,7 +6,7 @@ app = FastAPI()
 @app.get("/items/{item_id}")
 async def read_items(
     *,
-    item_id: int = Path(..., title="The ID of the item to get", gt=0, le=1000),
+    item_id: int = Path(title="The ID of the item to get", gt=0, le=1000),
     q: str,
 ):
     results = {"item_id": item_id}