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/server/server.py

@@ -7,9 +7,9 @@
 import argparse
 import asyncio
 import functools
-import logging
 import inspect
 import json
+import logging
 import os
 import signal
 import sys
@@ -21,7 +21,8 @@ from pathlib import Path
 from typing import Any, List, Union
 
 import yaml
-from fastapi import Body, FastAPI, HTTPException, Path as FastapiPath, Request
+from fastapi import Body, FastAPI, HTTPException, Request
+from fastapi import Path as FastapiPath
 from fastapi.exceptions import RequestValidationError
 from fastapi.responses import JSONResponse, StreamingResponse
 from pydantic import BaseModel, ValidationError