build: format codebase imports using ruff linter (#1028)

# What does this PR do?

- Configured ruff linter to automatically fix import sorting issues.
- Set --exit-non-zero-on-fix to ensure non-zero exit code when fixes are
applied.
- Enabled the 'I' selection to focus on import-related linting rules.
- Ran the linter, and formatted all codebase imports accordingly.
- Removed the black dep from the "dev" group since we use ruff

Signed-off-by: Sébastien Han <seb@redhat.com>

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
[Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.*]

[//]: # (## Documentation)
[//]: # (- [ ] Added a Changelog entry if the change is significant)

Signed-off-by: Sébastien Han <seb@redhat.com>

llama_stack/distribution/client.py

@@ -5,18 +5,16 @@
 # the root directory of this source tree.
 
 import inspect
-
 import json
 from collections.abc import AsyncIterator
 from enum import Enum
-from typing import Any, get_args, get_origin, Type, Union
+from typing import Any, Type, Union, get_args, get_origin
 
 import httpx
 from pydantic import BaseModel, parse_obj_as
 from termcolor import cprint
 
 from llama_stack.apis.version import LLAMA_STACK_API_VERSION
-
 from llama_stack.providers.datatypes import RemoteProviderConfig
 
 _CLIENT_CLASSES = {}