Add Python SDK public API and examples

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

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

@@ -0,0 +1,20 @@
+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()
+
+from codex_app_server import Codex
+
+with Codex(config=runtime_config()) as codex:
+    print("metadata:", codex.metadata)
+
+    models = codex.models()
+    print("models.count:", len(models.data))
+    if models.data:
+        print("first model id:", models.data[0].id)