chore: simplify authorized sqlstore (#3496)

# What does this PR do?

This PR is generated with AI and reviewed by me.

Refactors the AuthorizedSqlStore class to store the access policy as an
instance variable rather than passing it as a parameter to each method
call. This simplifies the API.

# Test Plan

existing tests

llama_stack/providers/utils/inference/inference_store.py

@@ -54,7 +54,7 @@ class InferenceStore:
 
     async def initialize(self):
         """Create the necessary tables if they don't exist."""
-        self.sql_store = AuthorizedSqlStore(sqlstore_impl(self.sql_store_config))
+        self.sql_store = AuthorizedSqlStore(sqlstore_impl(self.sql_store_config), self.policy)
         await self.sql_store.create_table(
             "chat_completions",
             {
@@ -202,7 +202,6 @@ class InferenceStore:
             order_by=[("created", order.value)],
             cursor=("id", after) if after else None,
             limit=limit,
-            policy=self.policy,
         )
 
         data = [
@@ -229,7 +228,6 @@ class InferenceStore:
         row = await self.sql_store.fetch_one(
             table="chat_completions",
             where={"id": completion_id},
-            policy=self.policy,
         )
 
         if not row: