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/providers/inline/inference/meta_reference/parallel_utils.py

@@ -22,16 +22,13 @@ from typing import Callable, Generator, Literal, Optional, Union
 
 import torch
 import zmq
-
 from fairscale.nn.model_parallel.initialize import (
     get_model_parallel_group,
     get_model_parallel_rank,
     get_model_parallel_src_rank,
 )
-
 from pydantic import BaseModel, Field
-
-from torch.distributed.launcher.api import elastic_launch, LaunchConfig
+from torch.distributed.launcher.api import LaunchConfig, elastic_launch
 from typing_extensions import Annotated
 
 from llama_stack.providers.utils.inference.prompt_adapter import (