Format logger style (#302)

## Summary

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Older logger style is not clear to display which function:line_number to
executed so that i append function_name and line_number and color the
print. Refer to:

<img width="1808" height="390" alt="image"
src="https://github.com/user-attachments/assets/aefd2043-2580-448d-a7af-54f5851b2b34"
/>


## Details

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- [ ]

## Test Plan

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## Related Issues

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- Resolves #

---

- [x] "I certify that all code in this PR is my own, except as noted
below."

## Use of AI

- [ ] Includes AI-assisted code completion
- [ ] Includes code generated by an AI application
- [ ] Includes AI-generated tests (NOTE: AI written tests should have a
docstring that includes `## WRITTEN BY AI ##`)

Signed-off-by: guangli.bao <[email protected]>

Author: tukwila

src/guidellm/logger.py

@@ -71,7 +71,8 @@ def configure_logger(config: LoggingSettings = settings.logging):
     logger.add(
         sys.stdout,
         level=config.console_log_level.upper(),
-        format="{time} | {function} | {level} - {message}",
+        format="<green>{time:YY-MM-DD HH:mm:ss}</green>|<level>{level: <8}</level> \
+        |<cyan>{name}:{function}</cyan>:<cyan>{line}</cyan> - <level>{message}</level>"
     )
 
     if config.log_file or config.log_file_level: