fix: generate validation middleware stubs

Signed-off-by: lucarlig <luca.carlig@ibm.com>

Author: lucarlig

.secrets.baseline

@@ -0,0 +1,12 @@
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+STUB_PATH = ROOT / "tools_rust" / "validation_middleware_rust" / "python" / "validation_middleware_rust" / "__init__.pyi"
+
+
+def test_validation_middleware_rust_generates_packaged_stub():
+    stub = STUB_PATH.read_text(encoding="utf-8")
+
+    assert "class Validator:" in stub
+    assert "def validate_http_request" in stub
+    assert "def validate_resource_path" in stub