[WIP] Support BLIP and GIT in image-to-text and VQA pipelines

[atturaioe]

What does this PR do?

Support BLIP and GIT models in image-to-text and VQA pipelines.

Fixes #21110

Before submitting

• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• [ x] Was this discussed/approved via a Github issue or the forum? Please add a link to it if that's the case.
• [ ] Did you make sure to update the documentation with your changes? Here are the documentation guidelines, and here are tips on formatting docstrings.
• [ ] Did you write any new necessary tests?

Who can review?

@NielsRogge

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[atturaioe]

Hi @NielsRogge, should I remove the return of the topk scores in the VQA pipeline that used ViltForQuestionAnswering only?

[github-actions[bot]]

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