add aurweb.asgi.id_redirect_middleware

A new middleware which redirects requests going to '/route?id=some_id'
to '/route/some_id'. In the FastAPI application, we'll prefer using
restful layouts where possible where resource-based ids are
parameters of the request uri: '/route/{resource_id}'.

Signed-off-by: Kevin Morris <kevr@0cost.org>

test/test_routes.py

@@ -148,3 +148,13 @@ def test_nonce_csp():
             if not (nonce_verified := (script.get("nonce") == nonce)):
                 break
     assert nonce_verified is True
+
+
+def test_id_redirect():
+    with client as request:
+        response = request.get("/", params={
+            "id": "test",  # This param will be rewritten into Location.
+            "key": "value",  # Test that this param persists.
+            "key2": "value2"  # And this one.
+        }, allow_redirects=False)
+    assert response.headers.get("location") == "/test?key=value&key2=value2"