Enable BLIP for auto VQA

[regisss]

What does this PR do?

When using a BLIP (not BLIP2) model with a pipeline for VQA, the following warning is displayed:

The model 'BlipForQuestionAnswering' is not supported for visual-question-answering. Supported models are ['Blip2ForConditionalGeneration', 'ViltForQuestionAnswering'].

Since there are some BLIP models for VQA on the hub (e.g. this one), this PR adds BLIP to the VQA auto class.

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[HuggingFaceDocBuilderDev]

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[ArthurZucker]

Thanks, this is already tested in BlipVQAModelTest but can you try adding the class to pipeline_model_mapping :

class BlipModelTest(ModelTesterMixin, PipelineTesterMixin, unittest.TestCase):
    all_model_classes = (BlipModel,) if is_torch_available() else ()
    pipeline_model_mapping = (
        {
            "feature-extraction": BlipModel,
            "image-to-text": BlipForConditionalGeneration,
        }
        if is_torch_available()
        else {}
    )

If it was here we would have probably caught the failure!

[regisss]

Done @ArthurZucker! Actually it's just a warning so not sure the test would catch it.