Resource oriented design for shields (#399)

* init

* working bedrock tests

* bedrock test for inference fixes

* use env vars for bedrock guardrail vars

* add register in meta reference

* use correct shield impl in meta ref

* dont add together fixture

* right naming

* minor updates

* improved registration flow

* address feedback

---------

Co-authored-by: Dinesh Yeduguru <dineshyv@fb.com>

llama_stack/providers/tests/safety/conftest.py

@@ -37,6 +37,14 @@ DEFAULT_PROVIDER_COMBINATIONS = [
         id="together",
         marks=pytest.mark.together,
     ),
+    pytest.param(
+        {
+            "inference": "bedrock",
+            "safety": "bedrock",
+        },
+        id="bedrock",
+        marks=pytest.mark.bedrock,
+    ),
     pytest.param(
         {
             "inference": "remote",
@@ -49,7 +57,7 @@ DEFAULT_PROVIDER_COMBINATIONS = [
 
 
 def pytest_configure(config):
-    for mark in ["meta_reference", "ollama", "together", "remote"]:
+    for mark in ["meta_reference", "ollama", "together", "remote", "bedrock"]:
         config.addinivalue_line(
             "markers",
             f"{mark}: marks tests as {mark} specific",