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/bedrock/client.py

@@ -15,9 +15,7 @@ from llama_stack.providers.utils.bedrock.refreshable_boto_session import (
 )
 
 
-def create_bedrock_client(
-    config: BedrockBaseConfig, service_name: str = "bedrock-runtime"
-) -> BaseClient:
+def create_bedrock_client(config: BedrockBaseConfig, service_name: str = "bedrock-runtime") -> BaseClient:
     """Creates a boto3 client for Bedrock services with the given configuration.
 
     Args:

llama_stack/providers/utils/bedrock/config.py

@@ -28,8 +28,7 @@ class BedrockBaseConfig(BaseModel):
     )
     profile_name: Optional[str] = Field(
         default=None,
-        description="The profile name that contains credentials to use."
-        "Default use environment variable: AWS_PROFILE",
+        description="The profile name that contains credentials to use.Default use environment variable: AWS_PROFILE",
     )
     total_max_attempts: Optional[int] = Field(
         default=None,

llama_stack/providers/utils/bedrock/refreshable_boto_session.py

@@ -68,9 +68,7 @@ class RefreshableBotoSession:
 
         # if sts_arn is given, get credential by assuming the given role
         if self.sts_arn:
-            sts_client = session.client(
-                service_name="sts", region_name=self.region_name
-            )
+            sts_client = session.client(service_name="sts", region_name=self.region_name)
             response = sts_client.assume_role(
                 RoleArn=self.sts_arn,
                 RoleSessionName=self.session_name,