feat: plugin system and backend runtime flags (#2543)

tests/helpers/plugins_helper.py

@@ -0,0 +1,20 @@
+from letta.data_sources.redis_client import get_redis_client
+from letta.services.agent_manager import AgentManager
+
+
+async def is_experimental_okay(feature_name: str, **kwargs) -> bool:
+    print(feature_name, kwargs)
+    if feature_name == "test_pass_with_kwarg":
+        return isinstance(kwargs["agent_manager"], AgentManager)
+    if feature_name == "test_just_pass":
+        return True
+    if feature_name == "test_fail":
+        return False
+    if feature_name == "test_override_kwarg":
+        return kwargs["bool_val"]
+    if feature_name == "test_redis_flag":
+        client = await get_redis_client()
+        user_id = kwargs["user_id"]
+        return await client.check_inclusion_and_exclusion(member=user_id, group="TEST_GROUP")
+    # Err on safety here, disabling experimental if not handled here.
+    return False