Add support for modifying Processor Kwargs in modular
Author: yonigozlan
Pull request: yes

# What does this PR do?

Add support for modifying `ProcessingKwargs`, `ImagesKwargs` and `TextKwargs` in modular. It is currently needed for ColPali, and I think it's nice to have in general, as it could be useful for other multimodal models in the future. Added `modular_new_kwargs_model.py` to illustrate the need.

Also:
- Changed an error to a warning when an overwritten function isn't explicitly used in modular. This was making examples that used to work crash, and it seems a bit unnecessarily harsh 😅.
- Modified a bit the handling of relative imports to avoid false positives (not add "models" automatically if not present).
-  Fixes a problem introduced in a previous PR, not sure which one, where a call to `super()` would be kept after copying the parent function, when it should be removed.

On that last point, I also added the modular examples to the default call of `check_modular_conversion`, as otherwise, the modular examples aren't automatically updated when changes are made to `modular_model_converter`, which makes it hard to trace when issues are introduced. It does make the recurrent checks such as fix-copies heavier though, so not sure if there's a better way to do this.

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## Who can review?

@ArthurZucker 

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Comments:
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