Fix precommit check after moving to ruff (#927)

Lint check in main branch is failing. This fixes the lint check after we
moved to ruff in https://github.com/meta-llama/llama-stack/pull/921. We
need to move to a `ruff.toml` file as well as fixing and ignoring some
additional checks.

Signed-off-by: Yuan Tang <terrytangyuan@gmail.com>

llama_stack/providers/utils/kvstore/config.py

@@ -54,16 +54,11 @@ class SqliteKVStoreConfig(CommonConfig):
     )
 
     @classmethod
-    def sample_run_config(
-        cls, __distro_dir__: str = "runtime", db_name: str = "kvstore.db"
-    ):
+    def sample_run_config(cls, __distro_dir__: str = "runtime", db_name: str = "kvstore.db"):
         return {
             "type": "sqlite",
             "namespace": None,
-            "db_path": "${env.SQLITE_STORE_DIR:~/.llama/"
-            + __distro_dir__
-            + "}/"
-            + db_name,
+            "db_path": "${env.SQLITE_STORE_DIR:~/.llama/" + __distro_dir__ + "}/" + db_name,
         }