Add provider deprecation support; change directory structure (#397)

* Add provider deprecation support; change directory structure

* fix a couple dangling imports

* move the meta_reference safety dir also

llama_stack/providers/inline/agents/meta_reference/safety.py

@@ -0,0 +1,57 @@
+# 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.
+
+import asyncio
+
+from typing import List
+
+from llama_models.llama3.api.datatypes import Message
+from termcolor import cprint
+
+from llama_stack.apis.safety import *  # noqa: F403
+
+
+class SafetyException(Exception):  # noqa: N818
+    def __init__(self, violation: SafetyViolation):
+        self.violation = violation
+        super().__init__(violation.user_message)
+
+
+class ShieldRunnerMixin:
+    def __init__(
+        self,
+        safety_api: Safety,
+        input_shields: List[str] = None,
+        output_shields: List[str] = None,
+    ):
+        self.safety_api = safety_api
+        self.input_shields = input_shields
+        self.output_shields = output_shields
+
+    async def run_multiple_shields(
+        self, messages: List[Message], identifiers: List[str]
+    ) -> None:
+        responses = await asyncio.gather(
+            *[
+                self.safety_api.run_shield(
+                    identifier=identifier,
+                    messages=messages,
+                )
+                for identifier in identifiers
+            ]
+        )
+        for identifier, response in zip(identifiers, responses):
+            if not response.violation:
+                continue
+
+            violation = response.violation
+            if violation.violation_level == ViolationLevel.ERROR:
+                raise SafetyException(violation)
+            elif violation.violation_level == ViolationLevel.WARN:
+                cprint(
+                    f"[Warn]{identifier} raised a warning",
+                    color="red",
+                )