Begin adding a /safety/run_shield API

llama_toolchain/safety/api/endpoints.py

@@ -0,0 +1,28 @@
+# 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.
+
+from .datatypes import *  # noqa: F403
+from typing import Protocol
+
+from llama_models.llama3_1.api.datatypes import Message
+
+# this dependency is annoying and we need a forked up version anyway
+from pyopenapi import webmethod
+
+
+@json_schema_type
+class RunShieldRequest(BaseModel):
+    shield_type: ShieldType
+    messages: List[Message]
+
+
+class SafetyCheck(Protocol):
+
+    @webmethod(route="/safety/run_shield")
+    async def run_shield(
+        self,
+        request: RunShieldRequest,
+    ) -> ShieldResponse: ...