fixing image_utils.py todo
Author: skochar1
Pull request: yes

# What does this PR do?

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This PR resolves a longstanding TODO in src/transformers/image_utils.py by replacing the use of logger.warning with Python’s built-in warnings.warn for notifying users of unused or invalid parameters in image processor functions. This approach makes warnings more controllable, user-friendly, and consistent with Python best practices.

Specifically, this PR:
* Fixes a TODO comment by swapping logging for proper warning handling using warnings.warn(..., UserWarning, stacklevel=2).
* Adds/updates docstrings and type hints for the affected functions.
* Implements comprehensive tests in tests/utils/test_image_utils.py to cover all usage scenarios—including valid parameters, invalid parameters, and edge cases.
* Ensures warning messages are triggered and formatted as expected.
* Verifies correctness through syntax, imports, and end-to-end integration checks.

## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [x] Did you write any new necessary tests?


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## Failures

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