feat: add type stubs for cli, codegen, and security modules

openapi_first/security.pyi

@@ -0,0 +1,7 @@
+from typing import Any
+
+def parse_security_schemes(spec: dict[str, Any]) -> dict[str, dict[str, Any]]: ...
+def make_security_dependencies(
+    spec: dict[str, Any],
+    security_schemes: dict[str, dict[str, Any]],
+) -> dict[str, list[Any]]: ...