chore: chop fastapi_generator into its module

Decoupled the large script with distinct files and purpose.

Signed-off-by: Sébastien Han <seb@redhat.com>

scripts/openapi_generator/state.py

@@ -0,0 +1,23 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+"""
+Shared state for the OpenAPI generator module.
+"""
+
+from typing import Any
+
+from llama_stack.apis.datatypes import Api
+
+# Global list to store dynamic models created during endpoint generation
+_dynamic_models: list[Any] = []
+
+# Cache for protocol methods to avoid repeated lookups
+_protocol_methods_cache: dict[Api, dict[str, Any]] | None = None
+
+# Global dict to store extra body field information by endpoint
+# Key: (path, method) tuple, Value: list of (param_name, param_type, description) tuples
+_extra_body_fields: dict[tuple[str, str], list[tuple[str, type, str | None]]] = {}