Add Python type hints to generated model code

pyproject.toml

@@ -28,6 +28,9 @@ classifiers = [
 dev = [
     "flake8 >= 7.0.0",
     "jsonschema >= 4.21.1",
+    "mypy >= 1.14.1",  # latest version for Python 3.8 is 1.14.x
+    "pyrefly >= 0.28.1",
+    "pyright >= 1.1.403",
     "pyshacl >= 0.25.0",
     "pytest >= 7.4",
     "pytest-cov >= 4.1",