🐛 Fix path and query parameters receiving dict as valid (#287)

* 🐛 Fix path and query parameters accepting dict

* ✅ Add several tests to ensure invalid types are not accepted

* 📝 Document (to include tested source) using query params with list

* 🐛 Fix OpenAPI schema in query with list tutorial

docs/src/query_params_str_validations/tutorial013.py

@@ -0,0 +1,9 @@
+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(q: list = Query(None)):
+    query_items = {"q": q}
+    return query_items