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/safety/meta_reference/config.py

@@ -0,0 +1,48 @@
+# 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 enum import Enum
+from typing import List, Optional
+
+from llama_models.sku_list import CoreModelId, safety_models
+
+from pydantic import BaseModel, field_validator
+
+
+class PromptGuardType(Enum):
+    injection = "injection"
+    jailbreak = "jailbreak"
+
+
+class LlamaGuardShieldConfig(BaseModel):
+    model: str = "Llama-Guard-3-1B"
+    excluded_categories: List[str] = []
+
+    @field_validator("model")
+    @classmethod
+    def validate_model(cls, model: str) -> str:
+        permitted_models = [
+            m.descriptor()
+            for m in safety_models()
+            if (
+                m.core_model_id
+                in {
+                    CoreModelId.llama_guard_3_8b,
+                    CoreModelId.llama_guard_3_1b,
+                    CoreModelId.llama_guard_3_11b_vision,
+                }
+            )
+        ]
+        if model not in permitted_models:
+            raise ValueError(
+                f"Invalid model: {model}. Must be one of {permitted_models}"
+            )
+        return model
+
+
+class SafetyConfig(BaseModel):
+    llama_guard_shield: Optional[LlamaGuardShieldConfig] = None
+    enable_prompt_guard: Optional[bool] = False