Add Python SDK public API and examples

Co-authored-by: Codex <noreply@openai.com>

sdk/python/examples/04_models_and_metadata/async.py

@@ -0,0 +1,28 @@
+import sys
+from pathlib import Path
+
+_EXAMPLES_ROOT = Path(__file__).resolve().parents[1]
+if str(_EXAMPLES_ROOT) not in sys.path:
+    sys.path.insert(0, str(_EXAMPLES_ROOT))
+
+from _bootstrap import ensure_local_sdk_src, runtime_config
+
+ensure_local_sdk_src()
+
+import asyncio
+
+from codex_app_server import AsyncCodex
+
+
+async def main() -> None:
+    async with AsyncCodex(config=runtime_config()) as codex:
+        print("metadata:", codex.metadata)
+
+        models = await codex.models(include_hidden=True)
+        print("models.count:", len(models.data))
+        if models.data:
+            print("first model id:", models.data[0].id)
+
+
+if __name__ == "__main__":
+    asyncio.run(main())